TheCoolist is a mood board for your headspace.

  1. TheCoolist
  2. Personality
  3. Types
  4. ISTJ (The Inspector)

9 ISTJ Enneagram Types and ISTJ-A (Assertive) and ISTJ-T (Turbulent)

The nine ISTJ Enneagram types, ISTJ-A (Assertive), and ISTJ-T (Turbulent) are all subtypes of the Inspector (ISTJ) personality type. To understand the ISTJ Enneagram types, you must first consider the Inspector’s traits as one of the sixteen Myers-Briggs Type Indicator (MBTI) personalities. The MBTI describes the ISTJ traits as rational, principled, and logical. The Inspector breaks down into ISTJ-A (Assertive) or ISTJ-T(Turbulent), the two main subtypes of the MBTI personality system. Assertive and Turbulent Inspectors share the same core traits, but differ in how they view themselves and others.

ISTJ Subtypes
9 ISTJ Enneagram Types and ISTJ-A (Assertive) and ISTJ-T (Turbulent)

The nine ISTJ Enneagram types serve as additional subtypes. ISTJ Enneagram types (or ISTJ Enneatypes) are an extension of the primary ISTJ personality, as well as the ISTJ-T and ISTJ-A subtypes under the lens of the Enneagram of Personality. The Enneagram is a separate personality system with nine types. Joined with the MBTI’s definition of Inspectors, the Enneagram creates the nine ISTJ Enneagram types listed below.

  1. ISTJ Enneagram Type 1: ISTJs with Enneatype 1 are morally conscious and sensible, but stubborn perfectionists who hold themselves and others to high standards.
  2. ISTJ Enneagram Type 2: ISTJs with Enneatype 2 demonstrate the most empathy of the otherwise cold and impersonal Inspector. Type 2 ISTJs lack confidence, however.
  3. ISTJ Enneagram Type 3: ISTJs with Enneatype 3 are highly ambitious if emotionally distant and lacking in principles.
  4. ISTJ Enneagram Type 4: ISTJs with Enneatype 4 are staunch (albeit self-absorbed) individualists who break the Inspector’s traditionalist mindset so they can explore.
  5. ISTJ Enneagram Type 5: ISTJs with Enneatype 5 typify the Inspector through a highly logical, analytical mindset and general reservation.
  6. ISTJ Enneagram Type 6: ISTJs with Enneatype 6 are skeptics at heart but demonstrate fierce loyalty and devotion.
  7. ISTJ Enneagram Type 7: ISTJs with Enneatype 7 act enthusiastically, exhibiting adventure-seeking habits and impulsive tendencies.
  8. ISTJ Enneagram Type 8: ISTJs with Enneatype 8 act assertively, living independently while exhibiting a combative attitude.
  9. ISTJ Enneagram Type 9: ISTJs with Enneatype 9 are self-sacrificing peacemakers who value inner tranquility above all else.

Across society, ISTJs act as highly rational, analytical people with Introverted (I), Sensing (S), Thinking (T), and Judging (J) dominant psychological functions. Under the Enneagram, we can capture the nuances of the ISTJ personality type and how individual ISTJ can differ through their Enneatypes.

1. ISTJ Enneagram Type 1

The ISTJ Enneagram Type 1 is an ISTJ subtype that exemplifies the Inspector’s innate sensibility and determination. ISTJ Type 1 Inspectors fall under the primary ISTJ-A subtype due to their assertive qualities.

ISTJs with Enneatype 1 demonstrate two notable strengths. Firstly, Type 1 ISTJs are morally-conscious advocates with strong, vigorously researched opinions. Secondly, Type 1 Inspectors demonstrate outspokenness, being unafraid to defend what they believe is right. Inspectors with Enneatype 1 additionally exhibit two particular weaknesses. Firstly, Type 1 ISTJs are stubborn, displaying a prominent Inspector weakness that Type 1 ISTJs embody through their uncompromising nature. Secondly, ISTJs with Enneatype 1 are perfectionists who hold everyone, including themselves, to oftentimes impossible standards.

ISTJs with Enneatype 1 are the most outspoken, albeit high-functioning of the Inspector Enneatypes. Whereas other Inspectors are more reserved, Type 1 ISTJs may act like extroverts because of their outspoken, moral righteousness. To add, perfectionism pushes the ISTJs with Enneatype 1 to take on others’ tasks because they believe it’ll take less time. We see the perfectionist trait in famous Inspectors like Gordon Sumner, better known as Sting. He and other Type 1 ISTJs want complete control over their work, a trait which sharply contrasts with Type 7 Inspectors who are far less domineering.

2. ISTJ Enneagram Type 2

The ISTJ Enneagram Type 2 is an Enneagram-based subtype of the Inspector personality. ISTJs with Enneatype 2 are dutiful helpers who stick to structured systems and dedicate themselves to others. Type 2 ISTJs are also under the Turbulent subtype because of their more empathetic qualities.

Type 2 ISTJS have two main strengths. Firstly, ISTJs with Enneatype 2 are more empathetic than other subtypes because they’re more in touch with their emotions as a Turbulent subtype. Secondly, Type 2 ISTJs are detail-oriented, displaying strong planning skills and a tendency to stick to existing structures. The ISTJ Enneagram Type 2 also features two notable weaknesses. Firstly, ISTJs with Enneatype 2 can be possessive of others due to their fear of being unloved. Secondly, Type 2 ISTJs often have low self-confidence; they often prioritize others over themselves as a result.

Although Inspectors are not self-sacrificing by nature, Type 2 ISTJ stand out because they use their rational nature and logical mindset to help others. A great example of a Type 2 ISTJ is Natalie Portman. A Harvard graduate, Portman has academic pursuits (as is typical of ISTJs) yet also dedicates her time to philanthropic efforts. The caring disposition of Type 2 Inspectors contrasts with Type 4 ISTJs. The Type 4 subtype is very independent and has no desire to fulfill a community role like the helpful Type 2 Inspector subtype.

3. ISTJ Enneagram Type 3

The ISTJ Enneagram Type 3 is an Inspector personality subtype with ambitious, over-achieving, and highly reserved qualities. The Type 3 Inspector is also an ISTJ-A (Assertive) subtype because of their innate confidence and decreased social drive.

Two main strengths define the ISTJ Enneagram Type 3. Firstly, Inspectors with Enneatype 3 are ambitious; they’re driven by an innate determination to succeed and compete. Secondly, Type 3 ISTJs are hard-working thanks to their problem-solving skills, strong work ethic, and overachieving tendencies. Two weaknesses further characterize Type 3 ISTJs. Firstly, ISTJs with Enneatype 3 can be fairly impersonal and distant, prioritizing their goals over relationships. Secondly, Type 3 ISTJs may sacrifice their principles because they want to be the best.

Type 3 Inspectors are arguably the most driven of the ISTJ Enneagram subtypes. Whereas other Inspectors like to keep to themselves, Type 3 Inspectors don’t mind being the center of attention if it suits their goals. We see this trait exemplified by Matt Damon, a famous ISTJ and highly successful actor who welcomes attention for the sake of his career. That said, the innate determination and confidence of Type 3 ISTJs may lead them to sacrifice their values. Other ISTJ subtypes are too principled to do so. Inspectors with Enneatype 1 or Enneatype 5 especially uphold their values as they exemplify the Inspector’s sensible nature.

4. ISTJ Enneagram Type 4

The ISTJ Enneagram Type 4 is one of the nine Enneagram-based subtypes of the Inspector personality. ISTJs with Enneatype 4 are individualists who are willing to try new things, express their feelings, and explore their identities. Type 4 ISTJs also align with the primary subtype of ISTJ-T (Turbulent) because they’re emotionally reactive.

The ISTJ Enneagram Type 4 demonstrates two prominent character strengths. Firstly, Type 4 ISTJs like to explore, breaking the Inspector’s traditionalistic mindset. Secondly, Inspectors with Enneatype 4 are emotionally aware, displaying a strong desire for genuine self-expressiveness that is rarely seen in the withdrawn, Sensing-dominant ISTJ. Two core weaknesses also typify ISTJ Enneagram Type 4. Firstly, Type 4 Inspectors can be self-absorbed because they’re a Turbulent subtype—therefore, they worry about how they present themselves. Staunch individualism also contributes to Type 4 ISTJs’ self-absorbed nature. Secondly, ISTJs with Enneatype 4 sometimes lack self-confidence, especially if they fixate on standing out from the crowd.

Other ISTJ Enneatypes dislike sentimental notions and breaking tradition, but Type 4 Inspectors excel at self-expression and exploration. Notable Inspectors like American actor Nick Offerman display ISTJ and Enneatype 4 strengths. For example, Offerman likes to try new things, as evidenced by his pursuit of acting while enjoying carpentry, woodworking, and other hobbies. Getting out there and trying new things is generally stressful for ISTJs, including Inspectors with Enneatype 6. These ISTJs have a traditionalist mindset and prefer to stick to trusted, structured systems.

5. ISTJ Enneagram Type 5

The ISTJ Enneagram Type 5 is a subtype that typifies the analytical, investigative qualities of the Inspector personality. ISTJs with Enneatype 5 also belong to the main ISTJ-A (Assertive) subtype because they exemplify the best of the Inspector type.

Two notable strengths characterize Type 5 Inspectors. Firstly, ISTJs with Enneatype 5 are highly logical, enjoying the seeking and analysis of knowledge. Secondly, Type 5 ISTJs are analytical, typifying the Inspector’s penchant for thoroughness and investigative thinking. The ISTJ Enneagram Type 5 also demonstrates two core weaknesses. Firstly, Type 5 Inspectors are indecisive; they like to thoroughly assess (and thus overthink) their decisions before taking action. Secondly, Type 5 ISTJS are emotionally distant, epitomizing how Inspectors tend to act cold and disconnected from their loved ones.

All Inspectors value knowledge and rational thinking, but ISTJs with Enneatype 5 particularly stand out. Type 5 ISTJs like business magnate Warren Buffett love to learn. Buffett and other Type 5 ISTJs carefully analyze their options before making decisions. Unfortunately, a thirst for knowledge causes Type 5 ISTJs to neglect their relationships. Inspectors with a Type 5 Enneatype consequently struggle to connect with others, whereas Type 2 ISTJs demonstrate better emotional intelligence.

6. ISTJ Enneagram Type 6

The ISTJ Enneagram Type 6 is an Enneagram-based subtype of the primary Inspector personality. ISTJs with Enneatype 6 exhibit loyalty and skepticism, as well as Turbulent qualities due to their increased emotional awareness and lack of confidence.

The ISTJ Enneagram Type 6 has two main strengths. Firstly, Type 6 Inspectors act meticulously, taking great pains to complete their tasks and goals as effectively as possible. Secondly, ISTJs with Enneatype 6 are deeply dedicated and loyal. Whether it’s to their workplace, family, or community, Type 6 Inspectors demonstrate undying commitment. The ISTJ Enneagram Type 6 additionally features two core weaknesses. Firstly, Type 6 ISTJs have self-doubting tendencies largely due to their fear of the unknown as a Turbulent subtype. Secondly, Type 6 Inspectors are highly skeptical, overpreparing for risks and planning around what they perceive as logical flaws.

ISTJs with Enneatype 6 are amongst the most loyal and devoted Inspectors. Type 6 ISTJs stand out due to their dedication to friends and work, a trait magnified by the Inspector’s innate drive and determination. ISTJ celebrities like Rivers Cuomo from the American rock band Weezer demonstrate many Enneatype 6 traits. For example, Cuomo greatly dislikes being the center of attention like other Type 6 Inspectors. Even so, he perseveres because he’s dedicated to his music and fans. Type 6 ISTJs also sometimes succumb to their self-doubting tendencies, which contrasts with the more confident and emotionally distant Type 5 Inspector.

7. ISTJ Enneagram Type 7

The ISTJ Enneagram Type 7 is an Inspector personality subtype that exhibits enthusiasm and impulsive tendencies. We can categorize Inspectors with Enneatype 6 as ISTJ-Ts because of their more impulsive qualities.

Two main strengths characterize ISTJs with Enneatype 7. Firstly, Type 7 ISTJs are adventure-seekers, demonstrating enthusiasm for trying new things and exploring opportunities. Secondly, Type 7 Inspectors are action-oriented people who appreciate fast-paced and challenging careers. The ISTJ Enneagram Type 7 also features two notable weaknesses. Firstly, Inspectors with Enneatype 6 can be somewhat impulsive, which is a rarity among Inspectors. Secondly, Type 7 ISTJs are highly stubborn, preferring their methods over someone else’s.

ISTJs with Enneatype 7 stand out from other ISTJ Enneatypes because of their unusual impulsivity and optimism. Like other Inspectors, Type 7 ISTJs plan and analyze their actions. However, unlike other Inspectors, Type 7 ISTJs place significant trust in their instincts and adapt to changes if needed. Furthermore, Type 7 Inspectors are arguably the easiest to get along with due to their innate optimism—a trait exemplified by charismatic ISTJ celebrities like Denzel Washington. The impulsivity of the Type 7 Inspectors contrasts with ISTJ Enneatype 5 and Enneatype 1, both of who take their responsibilities very seriously and resist change

8. ISTJ Enneagram Type 8

The ISTJ Enneagram Type 8 is an assertive and challenging subtype of the Inspector personality. ISTJs with Enneatype 8 belong to the primary ISTJ-A (Assertive) subtype because of their fierce characteristics.

The ISTJ Enneagram Type 8 exhibits two primary strengths. Firstly, Type 8 Inspectors are very direct, typifying the Inspector’s clear and straightforward communication skills. Secondly, Type 8 ISTJs are independent due to their innate assertiveness and desire for control. Inspectors with Enneatype 8 also express two notable weaknesses. Firstly, Type 8 ISTJs can be domineering, sometimes coming across as highly controlling, prideful, or confrontational. Secondly, ISTJs with Enneatype 8 can be extremely rigid, exaggerating the Inspector’s traditionalist mindset and inflexible nature.

Among the ISTJ Enneatypes, Inspectors with Enneatype 8 are particularly direct, even verging on combative. All Inspectors are direct due to their Thinking (T) and Judging (J) functions, but the Type 8 ISTJ has fewer reservations about challenging other people’s ideas and values. Christopher Lee, a famous ISTJ, notably exhibited direct and domineering qualities similar to Enneatype 8. Meanwhile, Type 9 ISTJs are considerably more hospitable because they like to keep the peace and sometimes act as meditators.

9. ISTJ Enneagram Type 9

The ISTJ Enneagram Type 9 is the peacemaker subtype of the Inspector personality type. It is also part of the main ISTJ-T (Turbulent) subtype because ISTJs with Enneatype 9 tend to be more considerate of people’s emotions than other ISTJ Enneatypes.

Type 9 Inspectors have two notable strengths. Firstly, ISTJs with Enneatype 9 are harmonious, focusing on cultivating and maintaining a feeling of inner peace. Secondly, Type 9 Inspectors are more empathetic than most ISJTs, weighing emotional actions through an analytical lens. ISTJs with Enneatype 9 additionally have two main weaknesses. Firstly, Type 9 ISTJs hide their emotions, focusing them inwards to appear calm and efficient in the workplace. Secondly, Type 9 Inspectors are self-sacrificing due to their peacemaking tendencies and concealed emotions.

ISTJs with Enneatype 9 know that to achieve inner tranquility, they have to maintain peace between themselves and others. As a result, the Enneatype 9 personality reveals a more considerate yet still rational side of the Inspector personality. Famous ISTJs like Angela Merkel emphasized the importance of peace and working in harmony. Although Type 9 Inspectors avoid turmoil and conceal their emotions, they’re better equipped for delicate tasks than confrontational subtypes like Type 8 Inspectors.

What are the ISTJ wing types?

The main ISTJ wing types are as follows:

  1. ISTJ Enneagram Type 1 with a 9 wing
  2. ISTJ Enneagram Type 1 with a 2 wing
  3. ISTJ Enneagram Type 6 with a 5 wing
  4. ISTJ Enneagram Type 6 with a 7 wing
  5. ISTJ Enneagram Type 5 with a 4 wing
  6. ISTJ Enneagram Type 5 with a 6 wing

The ISTJ wing types listed above refer to Enneagram wings—the neighboring personality types found on either side of your ISTJ Enneatype. Each Enneatype only has two wings (e.g. the wings of ISTJ Type 5 are Type 4 and Type 6). To find your two wings, view the Enneagram model. The model features nine points to represent the nine subtypes. The two points on the left and right of your Enneatype are your wings. These wings represent the nuances of ISTJ Enneagram types, as well as additional characteristics ISTJs may express according to the Enneagram’s typology.

1. ISTJ Enneagram Type 1 with a 9 wing

The ISTJ Enneagram Type 1 with a 9 (ISTJ 1w9) wing is a combination of ISTJ Enneatype 1 and Enneatype 2 personalities. The primary Enneatype, Enneatype 1, is a stubborn perfectionist, while the Enneatype 9 wing seeks inner peace. The two Enneatypes push Inspectors to be diplomatic and righteous in their professional and personal life. ISTJ 1w9s retain their high standards but channel them into professionalism and organization. Type 1 ISTJs of this variety desire tranquility, so they’re considerate of others’ feelings in order to keep the peace. However, that doesn’t stop Type 1 ISTJs with a 9 wing from being judgemental. Even as they’re mediating conflicts, ISTJ 1w9s continue to hold others to high standards but won’t let their opinions cause turmoil.

2. ISTJ Enneagram Type 1 with a 2 wing

The ISTJ Enneagram Type 1 with a 2 wing (ISTJ 1w2) is a unique blend of ISTJ Enneatype 1 and ISTJ Enneatype 2. Inspectors with a dominant Enneatype 1 personality are sensible and morally righteous, whereas ISTJ Type 2s are empathetic, detail-oriented, and helpful. ISTJs with Enneatype 1 sometimes channel the organized nature of Enneatype 2 into their morality and work ethic. As a result, ISTJ 1w2s tend to be more empathetic and open-minded about others’ concerns instead of being stubbornly perfect. ISTJ 1w2s still hold themselves and others to high standards, but they’re committed to helping others and making ethical choices.

3. ISTJ Enneagram Type 6 with a 5 wing

The ISTJ Enneagram Type 6 with a 5 wing (ISTJ 6w5) refers to Inspectors with an Enneatype 6 personality and elements of Enneatype 5. Type 6 ISTJs are loyal if skeptical people. Meanwhile, ISTJs with Enneatype 5 are highly logical and analytical. Inspectors with a 6w5 personality draw on their wing’s investigative qualities to question everything around them. Innate skepticism enables analysis and overthinking. ISTJ 6w5s consequently crave stability and dedicate themselves to those they trust—while also nursing paranoia, restlessness, and risk aversion. As a result, ISTJ 6w5s value structure and rules because it promises familiarity and does not threaten unplanned changes.

4. ISTJ Enneagram Type 6 with a 7 wing

The ISTJ Enneagram Type 6 with a 7 wing (ISTJ 6w7) combines the traits of ISTJ Enneatype 6 and ISTJ Enneatype 7. Inspectors with Enneatype 6 demonstrate devotion and loyalty, while Type 7 ISTJs are enthusiastic and impulsive. Type 6 ISTJs are largely inflexible due to their innate skepticism, so their Enneatype 7 wing manifests as positivity and increased sensitivity. ISTJ 6w7s may experience greater self-doubt and indecision, but they make up for it by being more social, free-thinking, and optimistic than other ISTJs. ISTJ 6w7 may also be more sensitive to others’ opinions and long for new experiences that promise security. Unfortunately, these types of ISTJs are highly resistant to change because they don’t typically embrace their wing’s impulsivity.

5. ISTJ Enneagram Type 5 with a 4 wing

The ISTJ Enneagram Type 5 with a 4 wing (ISTJ 5w4) is a blend of the ISTJ Enneatype 5 and ISTJ Enneatype 4 personalities. The Type 5 ISTJ values knowledge and has a penchant for thoroughness. The Enneatype 4 wing, on the other hand, pushes forward qualities of individualism and competency. Together, Enneatype 5 with Enneatype 4 wing enables determination, a thirst for knowledge, and independence in Inspectors. ISTJ 5w4s channel their sensible, rational selves into their pursuits, illustrating a deep desire for learning and education. However, due to the influence of the Enneatype 4 wing, Inspectors with a 5w4 personality also exhibit stronger introversion tendencies. Establishing relationships can be difficult as a result.

6. ISTJ Enneagram Type 5 with a 6 wing

The ISTJ Enneagram Type 5 with a 6 wing (ISTJ 5w6) is a blend of the ISTJ Enneatype 5 and Enneatype 6 personalities. Type 5 ISTJs are emotionally distant investigators who think before taking action. Meanwhile, the Type 6 ISTJ demonstrates skeptical thinking and a fierce dedication to loved ones. The two Enneatype combinations create a highly logical but considerate Inspector. ISTJ 5w6s want to be useful, and thus fill their life with duty and knowledge. ISTJ 5w6s are the kind of friends you want in a crisis because they’re both loyal and logical. However, ISTJ 5w6s also dislike talking about their emotions and may avoid emotionally charged situations.

What are the main Enneagram types of ISTJ?

The main Enneagram types of ISTJ are Enneatype 1, Enneatype 5, and Enneatype 6. A study from Typology Central reports that Enneatype 1 is the most prevalent ISTJ Enneatype, with 30% of Inspectors identifying as type ones. Meanwhile, 29% of ISTJs identify with Enneatype 5 and Enneatype 6, respectively.

The main Enneagram ISTJ types are more similar than different because they emphasize how Inspectors value analytical thinking, fulfilling commitments, and sticking to one’s principles. That said, the main ISTJ Enneatypes do contrast in three notable ways. Firstly, Type 1 ISTJs display perfectionist tendencies that Type 5 and Type 6 ISTJs do not. Secondly, Type 5 Inspectors love learning but tend to be more indecisive than the other main ISTJ Enneagram types. Finally, Type 6 ISTJs stand out from ISTJ Enneatypes due to their innate skepticism. These subtle but important differences highlight the nuances of the Inspector personality type, best captured by taking an ISTJ Enneagram type test.

How are ISTJ Enneagram types analyzed with ISTJ Enneagrams?

The ISTJ Enneagram types are analyzed with ISTJ Enneagram through the greater typologies of the Enneagram of Personality and the Myers-Briggs Type Indicator (MBTI), respectively. The Enneagram of Personality identifies and categorizes shared human characteristics, motivations, and values into nine types (also called Enneatypes). Meanwhile, the MBTI categorizes personality into sixteen personality types. ISTJ is one such personality type.

It’s important to note that the Enneagram and MBTI are two separate systems. We’ve used the competing typologies to interpret the nuances of the MBTI personality types, which leads to nine possible ISTJ Enneagram subtypes.

We can further infer which ISTJ Enneatypes demonstrate characteristics of the main ISTJ subtypes, ISTJ-A (Assertive) or ISTJ-T (Turbulent), according to the MBTI’s typology. In total four ISTJ Enneagram types exhibit Assertive Inspector qualities—ISTJs with Enneatypes 1, 3, 5, and 8. Meanwhile, five ISTJ Enneagram types exhibit Turbulent Inspector traits—ISTJs with Enneatypes 2, 4, 6, 7, and 9.

How does MBTI interpret ISTJ Enneagram type with the help of Enneagram?

The MBTI cannot technically interpret ISTJ Enneagram types with the help of the Enneagram because the MBTI is a separate typology. The MBTI groups personality into sixteen archetypes according to four psychological dichotomies. The MBTI, like the Enneagram, assigns types by taking a test. However, unlike the Enneagram, the MBTI defines personality according to Carl Jung’s stricter psychological methods. ISTJs who take the Enneagram test will likely have different results, giving way to nine ISTJ Enneatypes.

To analyze the nine ISTJ Enneatypes, we’ve applied the MBTI’s definition of the ISTJ personality and highlighted characteristics Inspectors could present according to their Enneatype and core MBTI traits.

Other experts have done similarly. The MBTI’s approach provides a broad categorization with ample opportunity for interpretation under the Enneagram’s methodology. For example, Managing Psychological Factors in Information Systems Work by Eugene Kaluzniacky explores complementary uses of the MBTI and Enneagram. Psychotherapist Pat Wyman also discusses the uses of both systems for shared goals in her book Three Keys to Self-Understanding.

How are ISTJ Enneagram types classified?

The ISTJ Enneagram types are classified according to the MBTI and Enneagram of Personality methodologies. The MBTI classifies personality based on four psychological dichotomies of two opposing functions—Extroversion (E) versus Introversion (I), Sensing (S) versus iNtuition (N), Thinking (T) versus Feeling (F), and Judging (J) versus Perceiving (P).

To identify your propensity for each of the four dichotomies, you must take an MBTI personality test. The results will group your answers into one of sixteen personality types, including ISTJ (better known as the Inspector). Results will also determine whether you’re an STJ-A (Assertive) or ISTJ-T (Turbulent) according to how you perceive yourself and interact with the world around you.

The Enneagram of Personality does not have strict psychological dichotomies like the MBTI. Instead, the Enneagram test poses questions about your beliefs, motivations, and fears—effectively assessing personality from a more emotional perspective. Results are grouped into one of nine personality types with a shared core belief. You may also identify your Enneagram wing, which highlights additional characteristics based on neighboring Enneatypes.

How are ISTJ Enneagram types found?

The ISTJ Enneagram types were found by bridging the MBTI and Enneagram of Personality typologies. No one person is solely responsible for this approach as the MBTI and Enneagram are separate systems. The MBTI was created by Katharine Cook Briggs and her daughter Isabel Briggs Myers. The two based their personality typology on the work of the Swiss psychiatrist Carl Jung. Meanwhile, the Enneagram of Personality has unclear origins, but the modern model derives from Bolivian philosopher Oscar Ichzao and Chilean psychiatrist Claudio Naranjo, who was inspired by Ichzao’s theories. The ISTJ Enneagram—as well as other MBTI Enneagrams—are essentially an amalgamation of Ichzao’s, Naranjo’s, and the Briggs-Myers duo’s work, giving rise to nine unique ISTJ subtypes.

What is the ISTJ-A (Assertive)?

The ISTJ-A (Assertive) is one of two main subtypes of the Inspector personality type. Individuals with an ISTJ-A subtype share the same core traits and psychological functions as their counterpart, ISTJ-T (Turbulent), but with a few notable differences. For example, Assertive Inspectors are more confident and forthright with their analytical assessments. ISTJ-As additionally approach life more calmly, being less susceptible to their impulses and peer pressure but more resistant to change.

ISTJs with Enneatype 1, Enneatype 3, Enneatype 5, and Enneatype 8 share features with the main ISTJ-A subtype. These ISTJ Enneatypes are notably more confident and independent than other Inspectors. People with ISTJ Enneatype 1, 3, 5, and 8 personalities tend to completely focus on their commitments and personal goals. Other common ISTJ-As features include a strong dedication to work and an innate sense of responsibility. ISTJ-As also tend to be indifferent to the emotional needs of others because of their decreased sense of empathy. As a result, Type 1, 3, 5, and 8 Inspectors may be poor team players who function best if they’re independent.

What are the key characteristics of ISTJ-A?

Below are the key characteristics of ISTJ-A.

  • Confidence: Assertive Inspectors are less prone to stress which allows them to act with a confident, calm mind. ISTJ-A’s heightened confidence additionally allows them to be more open with their judgments and assessments.
  • Inflexibility: ISTJ-As are less impulsive and thus less willing to change. Unexpected challenges pose a major challenge for ISTJ-As due to their inflexibility.
  • Independence: All Inspectors are fairly solitary, but individuals with an Assertive subtype are notably more self-reliant and less affected by others’ opinions due to their stronger sense of self.
  • Inexpressiveness: Assertive ISTJs struggle to express themselves, especially if they’re in the wrong. As a result, ISTJ-As struggle to empathize with others and may appear cold or stiff.

The most prominent ISTJ-A traits from the list above are inflexibility and inexpressiveness. Inspectors collectively resist change and appear emotionless due to their analytical mindset. ISTJ-As magnify these traits as they’re more straightforward and confident than ISTJ-Ts.

The traits of inflexibility and inexpressiveness additionally help ISTJ-As to stand out from the MBTI’s classification of the Inspector personality. Since not all ISTJs express their traits equally, classifying them into either Assertive or Turbulent allows us to shed light on the nuances of the Inspector type.

What is the ISTJ-T (Turbulent)?

The ISTJ-T (Turbulent) is one of the Inspector personality’s main subtypes. Inspectors with a Turbulent subtype share the same core characteristics as Assertive Inspectors but demonstrate several distinctive qualities. For example, ISTJ-Ts are more emotionally reactive and impulsive than ISTJ-As. Although the Inspector personality is largely unempathetic due to the Thinking (T) function, ISTJ-Ts are sensitive to and act on others’ opinions because they lack self-confidence. Turbulent Inspectors are also less willing to confront others, but they’re more willing to adapt if it’s the logical thing to do.

ISTJs with Enneatype 2, Enneatype 4, Enneatype 6, Enneatype 7, and Enneatype 9 demonstrate qualities of the main Turbulent Inspector subtype. These ISTJ Enneatypes tend to lack self-confidence, prioritize others’ needs, or appear more emotionally competent than the more frank, Assertive ISTJ Enneatypes. Most ISTJ-Ts are poor team players, but they value others’ opinions whereas ISTJ-As don’t. Turbulent Inspectors take their responsibility seriously and try to express their emotions, albeit often unsuccessfully. People with the ISTJ-T subtype are quick to stress if plans go awry. That said, ISTJ-Ts will adapt because they care about their reputation and fear being seen as incompetent or irresponsible.

What are the key characteristics of ISTJ-T?

Below are the key characteristics of ISTJ-T.

  • Sensitivity: All Inspectors are ruled by logical thought, but ISTJ-Ts are sensitive to others’ opinions because they greatly value their reputation.
  • Lack of confidence: Turbulent Inspectors have self-esteem because of outside influences, leading to a lack of confidence and self-critical tendencies.
  • Flexibility: Most Inspectors can be stubborn and resistant to change due to their Judging (J) function. However, ISTJ-Ts are willing to adapt and try new things if it is the most logical thing to do or if it’s in the best interest of loved ones.
  • Expressiveness: ISTJ-Ts struggle to express their emotions, but they nonetheless try because they’re sensitive to how people view them. ISTJ-Ts may notably express themselves in an unhealthy manner as they’re prone to stress.

The two most prominent ISTJ-T traits from the list above are sensitivity and expressiveness because they’re related to how Inspectors handle stress.

Strengths, Stressors, and Suggestions Workbook for ISTJ by Ruth E. Schneider and David S. Prudhomme highlights a stress mode wherein introverted types like ISTJ tend to beat themselves up. ISTJ-Ts are particularly susceptible to stress triggers because they’re sensitive to others’ opinions and fear appearing incompetent. The ISTJs’ stress mode (an automatic, subconscious reaction) takes on extroverted elements, leading Turbubluent ISTJs to be more expressive and lash out. Assertive Inspectors are less likely to lash out while stressed because they’re more confident and independent. Common stress inducers for ISTJs, including ISTJ-Ts, are the unknown and the unplanned as defined in Type Talk at Work (Revised) by Otto Kroeger, Janet M. Thuesen, and Hile Rutledge.

Comparison of ISTJ-T and ISTJ-A

The comparison of ISTJ-T and ISTJ-A is made clear in the following table.

ISTJ Enneagram type ISTJ-A (Assertive) ISTJ-T (Turbulent)
Stress Management ISTJ-As are less prone to stress due to their innate confidence and independence. ISTJ-As do not manage stress well if faced with stress inducers like unplanned changes because they will resist change instead of adapting. ISTJ-Ts are more prone to stress. ISTJ-Ts manage stress by first lashing out, then adapting to save face and appear competent.
Business Life In business life, ISTJ-As are more confident than ISTJ-Ts but less flexible. Assertive ISTJs are also poor team players who may be indifferent to their coworker’s opinions. In business life, ISTJ-Ts are less confident but more flexible. Like ISTJ-As, Assertive ISTJs are poor team players, but they are notably more willing to respect others’ opinions.
Social Life ISTJ-As are largely independent and inexpressive in their social life. ISTJ-As will take commitments seriously but act indifferent to others’ emotions. ISJT-As are sensitive to others’ emotions and susceptible to outside influences in their social life. ISTJ-Ts try to be expressive and open but may struggle due to the Inspector’s analytical mindset.
Relationships ISTJ-As are dedicated to their relationships as long as they have alone time. For example, ISTJ-As will meet obligations but prefer to maintain their independence. ISTJ-Ts are also dedicated to their relationships. Unlike ISTJ-As, Turbulent ISTJs tend to be more sensitive to their partner’s emotional needs.
Behaviors ISTJ-As behave in a confident, analytical, and forthright manner. In business life, ISTJ-As are more confident than ISTJ-Ts but less flexible. Assertive ISTJS are also poor team players who may be indifferent to their co-workers’ opinions.
Strengths The greatest strengths of ISTJ-As include confidence and independence. ISTJ-As will have additional strengths depending on their Enneatype. The greatest strengths of ISTJ-Ts include flexibility, increased empathy, and expressiveness. ISTJ-Ts will have additional strengths depending on their Enneatype.
Weaknesses The greatest weaknesses of ISTJ-As include inflexibility and inexpressiveness. Assertive ISTJs will exhibit additional weakness depending on their Enneatype. The greatest weaknesses of ISTJ-Ts include a lack of self-confidence and fear of appearing incompetent. Turbulent ISTJs will exhibit additional weakness depending on their Enneatype.

The table above showcases how susceptible Assertive and Turbulent ISTJs are to stress and how they cope in two distinctly different ways. Firstly, ISTJ-As are less prone to stress because they’re inherently more confident and independent than ISTJ-Ts. Stressed Assertive ISTJs will stick to the processes and solutions they know instead of adapting due to their propensity for traditional thinking. Secondly, ISTJ-Ts are more prone to stress because they lack self-confidence and succumb to peer pressure. Turbulent Inspectors lash out to cope with stress but eventually adapt to the stress triggers, especially if they risk looking incompetent.

Which ISTJ Enneagram type is better in relationships?

ISTJs with Enneatype 2 and Enneatype 9 are better at relationships for two reasons. First, Type 2 Inspectors exhibit greater empathy than other ISTJ subtypes. Therefore, Inspectors with Enneatype 2 have an easier time understanding and meeting their partner’s emotional needs. Second, Type 9 ISTJs are deeply devoted to those they care about. Inspectors with Enneatype 9 may struggle with their innate skepticism, but they’re nevertheless fiercely loyal. ISTJs with either Enneatype 2 or Enneatype 9 can excel in relationships of any kind. Meanwhile, Type 5 ISTJs may struggle with relationships because they’re too emotionally distant to form deep connections.

Which ISTJ Enneagram type is better for family life?

The ISTJ Enneagram type that’s better for family life is ISTJ Enneagram Type 2. Any ISTJ enneatype can have a successful family life because Inspectors take responsibilities like family seriously. Inspectors with Enneatype 2 specifically stand out because they’re dutiful, helpful, and sensitive to others’ needs. Conversely, Type 8 Inspectors may not be less-suited for family life because they’re domineering and extremely rigid.

ISTJs with Enneatype 2 also show a strong propensity for self-sacrifice. This may be problematic if a Type 2 ISTJ is raising children or acts as the breadwinner. However the giving nature of Type 2 Inspectors serves to benefit the entire family, including the ISTJ, if healthily managed.

Which ISTJ Enneagram type is better for sensitive people?

The ISTJ Enneagram type that is better for sensitive people varies between two subtypes. First, Type 2 Inspectors demonstrate greater empathy than other ISTJs so they’d be more considerate of sensitivity issues and the like. Second, Type 9 Inspectors are natural peacemakers who’d be mindful of sensitive people. The worst ISTJ Enneagram type for sensitive people is the Type 8 ISTJ. Inspectors with Enneatype 8 personalities can be combative and challenging, which is likely to hurt the feelings of sensitive people.

Which ISTJ Enneagram type is more confident?

The most confident ISTJ Enneagram type is the Type 8 ISTJ for two reasons. Firstly, Type 8 Inspectors are assertive, exemplifying the innate confidence of the ISTJ-A (Assertive) subtype. Secondly, Type 8 ISTJs live very independently which requires a strong backbone and high self-esteem. Inspectors with an Enneatype 8 personality are likely to thrive, no matter the challenge or situation. The least confident ISTJ Enneatype is arguably ISTJ Enneagram Type 8 due to their self-doubting tendencies and Turbulent qualities.

Which ISTJ Enneagram type is better for a career?

The ISTJ Enneagram type that’s better for careers varies between the following three subtypes. First, Type 3 Inspectors are great at their careers because they’re highly ambitious over-achievers. Second, ISTJs with Type 5 personalities are competent employees due to their analytical mindset and penchant for thoroughness. Finally, Type 8 ISTJs excel professionally because they’re not afraid of challenges or being independent.

No ISTJ Enneatype is likely to struggle career-wise because all Inspectors take their responsibilities very seriously, particularly in the workplace.

Which ISTJ Enneagram type is better for teamwork?

None of the ISTJ Enneagram types is better at teamwork because Inspectors are poor team players due to their naturally reserved, stubborn mindsets. ISTJs with Enneatype 2 and Enneatype 9 will be sensitive to their coworkers’ needs, but they prefer to work alone than in teams. Meanwhile, Type 8 and Type 1 Inspectors are exceptionally bad at teamwork because of their domineering personalities and perfectionist tendencies, respectively.

Which ISTJ Enneagram type is better for artists?

The ISTJ Enneagram type that’s better for artists is ISTJ Enneagram Type 4. Inspectors with an Enneatype 4 personality are individualists who like to explore, so they’re likely to try out creative pursuits. Although the Inspector personality isn’t typically creative, Type 4 ISTJs break the mold by definition. Conversely, Type 5 ISTJs may be ill-suited for the creative arts because they’re highly analytical and prefer logical pursuits.

Which ISTJ Enneagram type is fun to be with?

ISTJ Enneagram Type 7 is the most fun to be with because they’re optimistic adventure-seekers. Being friends with a Type 7 Inspector is sure to be an exciting experience because they’re naturally cheery and somewhat impulsive. Conversely, it may not be as fun to hang out with Type 1 or Type 5 ISTJs. Inspectors with Enneatype 1 are morally upstanding but stubborn perfectionists who may struggle to relax. Meanwhile, Type 5 ISTJs are emotionally distant and thus struggle to form deep, much less fun-loving connections.

Which ISTJ Enneagram type has a rare personality?

ISTJ Enneagram Type 3 and Type 7 appear to be rare personalities. A study on Enneagram and MBTI correlation showed that Inspectors tend to test primarily for Enneatype 1, 5, and 6. Of these results, only 1% of ISTJs identified with Enneatype 3 while none tested for Enneatype 7. According to this evidence, we can infer that ISTJ Enneagram Type 3 and Type 7 are exceedingly rare.

Do ISTJ Enneagram types change according to gender?

There is no evidence indicating ISTJ Enneagram types change according to gender. Furthermore, there is no notable disparity between ISTJ men and ISTJ women across the general population. Research shows that 10.1% of men and 10.3% of women identify with the Inspector personality, respectively.

Can someone change their character from an ISTJ Enneagram type to another?

It may be possible for someone to change their character from one ISTJ Enneagram type to another according to two different studies. First, a study by R. Chris Fraley and Nathan Hudson saw changes in participants’ self-reported traits after sixteen weeks of voluntary self-improvement. Second, a study from the University of California indicates that intervention at the right age can enable positive personality changes.

In the first study, Fraley and Hudson asked participants to use the Big 5 personality test to define traits they want to change. Although separate from the MBTI and Enneagram, the Big 5 holds credibility in this context because it’s another, well-researched personality system. Fraley and Hudson also felt that the timeframe may be too short to support permanent changes. However, their research suggests that some change, even temporary, is possible as long as you assess and actively improve your traits.

In the second study, professors Wiebke Bleidorn, Christopher Hopwood, and their thirteen co-authors believe that enabling personality change may help predict success or dictate policy.

In both studies, no evidence suggests someone can alter their ISTJ Enneagram type since neither used the MBTI or Enneagram. Both studies support personality changes are possible to some degree, however. Therefore, we can infer that it’s also possible for someone to change their ISTJ Enneatype designation if they work on their traits.

Can someone be from multiple ISTJ Enneagram types?

No, someone cannot be from multiple ISTJ Enneagram types because you can only be assigned one Enneagram type by the Enneagram test. Your Assertive or Turbulent classification as an ISTJ may change if you become less or more self-confident, but your Enneagram type is assigned according to a core belief you share with a specific type. You may demonstrate elements of neighboring Enneatypes (known as Enneagram wings), but your dominant Enneagram type and its associated characteristics remain the same.

Who are the famous people from ISTJ Enneagram type?

Below is a list of famous people with ISTJ Enneagram types.

  • ISTJ Enneagram Type 1: British musician Gordon Sumner (better known as Sting) and American football coach Tom Landry demonstrate traits of the ISTJ Enneagram Type 1. Sting is a stubborn perfectionist who prefers total control over his music, while Landry exhibited a strong moral code and staunch sense of integrity commonly associated with Type 1 Inspectors.
  • ISTJ Enneagram Type 2: Natalie Portman is a celebrity who exhibits characteristics of the Inspector and Enneatype 2 personalities. Portman displays both empathy and a detail-oriented mindset by supporting many charities while juggling filming responsibilities.
  • ISTJ Enneagram Type 3: Jamie Hyneman and Matt Damon are two well-known Inspectors who align also with the Enneatype 3 personality. Jamie Hyneman is highly ambitious, if at times distant and impersonal due to his role on Mythbusters. Meanwhile, Matt Damon exhibits strong introverted tendencies despite his innate ambition, extensive filmography, and popularity.
  • ISTJ Enneagram Type 4: American actor Nick Offerman exemplifies aspects of the Type 4 ISTJ because he is highly independent. Like other Type 4 ISTJs, Nick Offerman exhibits a strong desire to explore, try new things, and pursue his interests outside of his acting career.
  • ISTJ Enneagram Type 5: Warren Buffett and George Washington are two examples of famous ISTJs with an Enneatype 5 personality. Buffett demonstrates a strong propensity for investigative thought and a penchant for thoroughness due to his careful business decisions. President Washing also expressed a similar mindset, relying on rational thought to create a democratic United States of America.
  • ISTJ Enneagram Type 6: Rivers Cuomo from the rock band Weezer aligns with the ISTJ Enneatype 6 personality because he’s shy yet devoted to his craft. Cuomo doesn’t want to be the center of attention, but his dedication to his band and fans motivates him to overcome his discomfort and fulfill his responsibilities as a stage performer.
  • ISTJ Enneagram Type 7: Robert De Niro and Denzel Washington exemplify the Type 7 ISTJ through their shared enthusiasm for acting. Robert De Niro is action-oriented despite being introverted, tackling many film projects over his extensive career. Washington acts similarly, while also being very charming and optimistic (key Enneatype 7 traits).
  • ISTJ Enneagram Type 8: The late Christopher Lee demonstrated an ISTJ Enneatype 8 personality. Lee was stubborn, domineering, and extremely rigid. He firmly believed in his methods and sometimes opposed others.
  • ISTJ Enneagram Type 9: Famous ISTJs Angela Merkel and John Wooden align with the Enneatype 9 personality. The former German chancellor Angela Merkel strongly believes in working with other nations and maintaining harmony between superpower countries. John Wooden, an American basketball coach, also demonstrated the peacemaking tendencies of the Type 9 ISTJ by emphasizing the importance of teamwork and communication.

How to understand which ISTJ Enneagram type you are?

To understand which ISTJ Enneagram type you are, follow the four steps below.

  1. Take the MBTI test: Taking the MBTI personality test will clarify whether you’re an ISTJ or a different personality type. Some online tests will also assign your Assertive or Turbulent subtype.
  2. Take the Enneagram test: After getting your MBTI results, take an Enneagram of Personality test. Several are available online. Taking the Enneagram test will pinpoint your Enneatype. The most common Enneagram results for Inspectors appear to be Enneatype 1, Enneatype 5, and Enneatype 6.
  3. Find your Enneagram wing: Your Enneagram results should show how highly you tested for other Enneagram types. Your Enneagram wing will be the neighboring Enneatype with the highest score. For example, your wing will be Enneatype 9 or Enneatype 2 depending on which has the highest score if you’re a Type 1 ISTJ.
  4. Assess your results: You may feel that your ISTJ Enneagram results miss the mark. Research your personality type to learn more about the associated characteristics, then retake the tests. Remember to answer the test questions as honestly as possible or you’ll get inaccurate results.

ISTJ Enneagram type Quiz Example

The ISTJ Enneagram type quiz example below attempts to align the MBTI and Enneagram typologies so you can identify your Enneatype as an Inspector.

  1. I tend to have impossible standards for myself or others: ISTJs with Enneatype 1 have perfectionistic tendencies which result in high or even impossible standards. Answering positively to this question is a good indication of an ISTJ Enneagram Type 1 personality.
  2. I desire acknowledgment from others: ISTJs with Enneatype 3 and Enneatype 6 want people to like them. Type 3 Inspectors desire recognition because they’re highly ambitious and overachieving. Meanwhile, Type 6 Inspectors want people to like them to appease self-doubting tendencies. Answering positively signifies an ISTJ Enneagram Type 3 or Type 6 personality.
  3. I tend to be very thorough: No stone goes uncovered with Type 5 ISTJs since they embody the Inspector’s investigative skills and analytical thinking. A positive answer to this question suggests the testee is an ISTJ with an Enneatype 6 subtype.
  4. I plan for the worst: Type 6 ISTJs are skeptical and tend to foresee the worst. Your response indicates Enneatype 6 traits if you’re an Inspector who tends to plan for the worst (even going so far as to draft logical ideas for disastrous problems).
  5. I tend to be direct while communicating: ISTJs with Enneatype 8 have assertive and analytical personalities, so they have no qualms about pointing out flawed logic—regardless of how it affects others’ feelings. A positive reply to this question suggests Type 8 ISTJ characteristics.
  6. I often act as the mediator in difficult situations: ISTJs with Enneatype 9 desire inner and external tranquility, so they’re notably more empathetic than other Inspectors. Your response implies an ISTJ Enneagram Type 9 personality if you often step in to mediate and rely on logic to compromise.
  7. I want to feel like an individual: Type 4 ISTJs break away from the Inspector’s standard rigidity so they can try new things and explore. Consequently, Type 4 ISTJs can be self-absorbed, focusing on how to be a unique individual. A positive answer to this question suggests you’re an ISTJ with an Enneatype 4 personality.
  8. I prioritize others over myself: ISTJs with Enneatype 2 are in touch with their emotions and thus feel a sense of duty to others. Your answer leans toward an ISTJ Type 2 personality result if you tend to put other people’s needs first.
  9. I value challenging careers: Inspectors with Enneatype 7 are unique among other ISTJs because they’re enthusiastic and action-oriented. Your response is indicative of a Type 7 ISTJ personality if you like an intellectually challenging workplace.
  10. I’m sometimes guilty of being distant: All Inspectors are introverts at heart, but the ISTJ Enneatype 5 typifies this trait, often appearing cold or unfeeling. An affirmative response to this question also highlights your small circle of loved ones as a Type 5 ISTJ.

How can ISTJ Enneagram types develop themselves?

The ISTJ Enneagram types can develop themselves by assessing their respective strengths and weaknesses, then working to improve themselves. The nine ISTJ Enneagram types share the same core traits and functions but differ in their Enneatypes as well as their Assertive or Turbulent categorization. Thus, Inspectors can work on traits associated with their main ISTJ personality type. Alternatively, Inspectors may develop traits associated with their Enneatype, Assertive, or Turbulent subtype. Inspectors can also work on the Enneatype or subtype characteristics that enhance or inhibit traits of their main ISTJ personality.

To develop your ISTJ Enneagram type, analyze the core weaknesses of the ISTJ personality type and how your Enneatype typifies these weaknesses. After which, try the six methods listed below.

  • Respect others’ opinions: All Inspectors are stubborn due to their Judging function, but ISTJs with Enneatype 1 and Enneatype 7 are particularly so due to their weaknesses. Actively working towards respecting others’ opinions can teach Type 1 and 7 Inspectors to compromise and be less stubborn.
  • Open up to others: ISTJs with Enneatype 3 and Enneatype 5 exemplify the emotionally reserved qualities of the Inspector. To combat this aspect of their personality, Type 3 and 5 Inspectors can start by stepping outside of their comfort zone and opening up to those they trust.
  • Find common ground: ISTJ Enneagram Type 8 is a notably rigid and challenging ISTJ subtype. Type 8 Inspectors can develop themselves by learning more about the opinions and systems they’re opposed to in order to find common ground with others.
  • Combat self-doubt: ISTJ Enneatype 2, Enneatype 4, Enneatype 6, and Enneatype 9 are prone to self-doubt due to their Turbulent qualities. These types of ISTJs can improve their self-esteem by pursuing their passions, seeking professional help, and confiding in friends.
  • Lessen your standards: Inspectors have a traditional mindset that’s hard to break away from, especially for perfectionists like Type 1 ISTJs. Inspectors with an Enneatype 1 personality can break inflexible thinking by reducing their standards and trusting others to share the burden of their work.
  • Accept that change is inevitable: Inspectors’ inflexibility is linked to their fear of the unknown. Assertive ISTJs like Type 5 or Type 1 ISTJs may be particularly resistant to change because the former typifies core ISTJ traits while the latter is a perfectionist. Type 5 and Type 1 Inspectors should confide in friends and speak to professionals to better cope with and eventually accept change.

Who are the famous experts for ISTJ Enneagram types?

There are no famous experts specifically for ISTJ Enneagram types because the MBTI (from which the ISTJ personality is derived) and the Enneagram are separate systems. There are prevailing experts in either field, including those listed below:

  • Pat Wyman: Pat Wyman is a psychotherapist and certified user of the MBTI who integrates the Enneagram and MBTI typologies into therapy. Wyman has written a book, Three Keys to Self-Understanding, about the application of both methods alongside a third psychological instrument called Inner-Child Healing.
  • Claudio Naranjo: Claudio Naranjo (1932 – 2019) was a Chilean psychiatrist who developed the modern basis of the Enneagram of Personality. Naranjo combined the theories of personality psychology and the work of Oscar Ichazo to create nine Enneatypes. Naranjo wrote two books on the subject, The Enneagram of Society and Ennea-type Structures.
  • Mary McCaulley: Mary McCaulley (1920 – 2003) was an American psychologist and co-founder of the Center of Applications of Psychological Type (CAPT) alongside Isabel Myers, the co-creator of the MBTI. McCaulley and Myers developed the first scoring program for the MBTI system and wrote the MBTI Manual with Isabel Myers, Dr. Naomi L. Quenk, and Dr. Allen L. Hammer.

What other personality Enneagram types are close to ISTJ Enneagram types?

The other personality Enneagram types that are close to ISTJ Enneagram types include ISTPs, ISFJs, and ESTJs. The list below highlights how the ISTJ Enneatypes relate to other ISTP, ISFJ, and ESTJ personalities differently

  • ISTP personalities: ISTPs are close to ISTJs with Enneatype 5, Enneatype 4, and Enneatype 7 for three reasons. First, ISTPs and Type 5 Inspectors are both emotionally distant, highly logical people who value analytical thought. Second, ISTPs have a lot in common with Type 4 ISTJs as they both display a strong propensity for individualism and a desire to explore. And finally, ISTPs and ISTJs with Enneatype 7 are similar due to their shared adventurous-seeking habits.
  • ISFJ personalities: ISFJs are close to ISTJs with Enneatype 1, Enneatype 2, and Enneatype 6 for the following three reasons. First, Type 1 Inspectors and ISFJs both lean on structured systems and their moral conscience. Second, ISFJs relate to Type 2 ISTJs as both groups of people are empathetic and want to help others. And finally, ISFJs and Type 6 ISFJs are close because they’re both deeply loyal to loved ones.
  • ESTJ personalities: ESTJs are close to ISTJs with Enneatype 8, Enneatype 3, and Enneatype 9 for three notable reasons. First, Type 8 ISTJs relate to ESTJ people because they’re similarly assertive in the workplace. Second, ESTJs and Type 3 Inspectors get along because they’re both ambitious and hard-working. And third, ESTJs and Type 9 ISTJs are similar since they understand the rationale of a harmonious workplace.