In this article, you’ll find comparisons of two personality types — ISTJs and the Enneagram Type 9s — across four important personality domains: Interpersonal/Communication Style, Emotional Style, Intellectual Style, and Organizational Style.
TraitLab collected data about personality traits from thousands of participants who identified as a particular type from the 16 Personality or Enneagram typology.
For each comparison area below, you’ll see show the average similarities and differences between ISTJs and Type 9s. While these comparisons are useful for understanding broad trends across these types, it’s important to remember that all personality types are oversimplifications. For an assessment of your unique personality, you’ll want to use an assessment that goes beyond single personality types.
ISTJ and Type 9 Interpersonal and Communication Styles
Your particular style of communicating and interacting with others can be described fairly well by two dimensions: assertiveness and warmth.
Assertiveness describes your tendency to assert yourself, lead, and influence others in social situations, while warmth describes your tendencies to empathize and put others’ needs ahead of your own.
People with the same personality type often share some similarities in assertiveness and warmth. In the graph below, you can see where most ISTJs and most Type 9s fall along both of these dimensions.
First, take a look at where people in each type, on average, fall in this interpersonal space.
A comparison of Enneagram ISTJs and Type 9s along interpersonal dimensions. The blue dot shows the average position of ISTJs, and the blue circle shows where roughly 50% of ISTJs fall in interpersonal space. The orange dot and circle show similar positions for Type 9s.
ISTJs are realists who perceive things and people clearly, without being overly optimistic. At their best, they are practical skeptics who are comfortable holding and sharing unorthodox, unpopular views. ISTJs may be overly skeptical and suspicious, and they may have difficulty trusting others. At their worst, they can struggle to make new friends and socialize, and have a hard time showing affection and admiration for others.
Type 9s often respect others, conform to expectations, and ask for guidance. At their best, they are loyal and reliable, and encourage others to guide and help. Type 9s may be overly clingy, gullible, and have difficulty expressing anger, even when appropriate. At their worst, they will try to please others too much, put others’ needs ahead of their own, and allow others to take advantage of them.
As a ISTJ, one notable difference between you and most Type 9s is in your interpersonal warmth. You are likely on the colder, more combative side of the spectrum. Compared to you and other ISTJs, Type 9s can sometimes feel overly focused on feelings and intentions, rather than the facts of the matter at hand.
However, you and most Type 9s both tend to be on the more reserved and passive side in social situations. On one hand, this is a benefit: both of you tend to be reliable partners, ready and willing to help each other when needed. On the other hand, your mutual passivity can stall decisions and action, especially if both of you are waiting for the other to take the lead.
ISTJ and Type 9 Emotional Styles
Another characteristic of your personality is your emotional style — your tendencies towards different kinds of moods. There are two dimensions that influence emotional style: arousal and valence.
Arousal describes your relative energy level across different situations. Those with high baseline levels of arousal tend to be generally more alert, active, and engaged, while those with a lower baseline are more reserved, subdued, and inhibited.
Valence describes whether these moods tend to be positive (pleasant) or negative (unpleasant). People with a more positively valenced style are more likely to experience emotions like joy, enthusiasm, satisfaction, and serenity. People with a more negatively valenced style are more likely to experience sadness, frustration, dissatisfaction, and anxiety.
The graph below shows where each type, on average, usually sits in this emotional space.
A comparison of ISTJs and Type 9s along emotional (or affective) dimensions. The blue dot shows the average position of ISTJs, and the blue circle shows where roughly 50% of ISTJs fall in interpersonal space. The orange dot and circle show similar positions for Type 9s.
Most ISTJs and Type 9s overlap heavily in their emotional style.
ISTJs and Type 9s have a tendency to be quiet and inhibited. Compared to most people, they can easily drift into gloom and melancholy. They see the glass as half-empty and have a more skeptical outlook and a hesitant approach to life. For better or worse, ISTJs and Type 9s tend to notice the negatives in most situations. In stressful times, they are more likely to withdraw quietly and retreat inward, rather than share their frustration with others.
Like many ISTJs, you and most Type 9s tend to be on the more reserved and quiet side. You both prefer to sit back and observe, and the two of you are usually perfectly happy with lower levels of excitement and stimulation. You understand each other’s need for personal space and solitude, and you are both content to leave each other to do their own thing.
Likewise, ISTJs and Type 9s often default to the negative side of the emotional spectrum. While you may not always express them, you are both more likely to experience negative emotions like sadness, worry, frustration, and impatience. It’s rare to find ISTJs or Type 9s in a bubbly, cheerful mood. Like most people, they have moments of joy and satisfaction, but these dissipate quickly. They often point out the negatives in most situations and have a more pessimistic outlook.
ISTJ and Type 9 Intellectual Styles
Your intellectual style describes how you receive, process, and pursue different kinds of information. Differences in intellectual style are captured well by two dimensions: ideas and aesthetics.
Ideas describes your appetite for new information and your interest in complex, challenging material. People high on the ideas dimension have an appreciation for complexity and technical details. People lower on ideas are less interested in learning for learning’s sake, and they prefer to simplify complex topics down to the essential details.
Aesthetics captures your relative interest and sensitivity to aesthetic information and its emotional impact. People higher on the aesthetics dimension usually have strong artistic interests and a deep appreciation for beauty in many forms. Those lower on aesthetics tend to value practical application over artistic merit and usually adhere to more conventional standards of beauty.
In the graph below, you’ll see where ISTJs and Type 9s, on average, fall in this intellectual space.
A comparison of ISTJs and Type 9s along intellectual dimensions. The blue dot shows the average position of ISTJs, and the blue circle shows where roughly 50% of ISTJs fall in intellectual space. The orange dot and circle show similar positions for Type 9s.
Most ISTJs and Type 9s overlap heavily in their intellectual style.
ISTJs and Type 9s are practical realists. They focus on building practical skills and essential knowledge and are less likely to spend time learning for learning’s sake. In addition, they usually value conventional, tangible accomplishments over artistic expression and rarely feel compelled to develop a creative outlet.
As a ISTJ, you and most Type 9s are down-to-earth, straightforward thinkers. You’d both prefer to stick to the essentials and focus on practical issues, and you try to avoid overcomplicating matters. When you and your Type 9 counterpart are together, your conversations are more likely to revolve around concrete details, facts, and conventional topics rather than theoretical or philosophical ones.
Likewise, ISTJs and Type 9s share an appreciation for practical, tangible accomplishments over artistic expression. ISTJs and Type 9s are both likely to embrace conventional ways of thinking, and both types are more skeptical of eccentric or unusual approaches to solving problems.
ISTJ and Type 9 Organizational Styles
Your organizational style describes your habits around organization and planning. Your organizational style influences how you structure your time and physical space. Differences in organizational style fall along two dimensions: industriousness and orderliness.
Industriousness describes your persistence, need for achievement, and intensity of focus. People higher on industriousness usually organize their behavior around a few important long-term goals. People lower on industriousness are usually more focused on the present and will more easily change their focus when new opportunities appear.
Orderliness describes your need for regularity, order, and structure in your environment. People higher on orderliness prefer tidy, organized physical spaces, detailed schedules, and reliable routines. People lower on orderliness can tolerate more disorganization and prefer a more spontaneous, unstructured approach.
The graph below shows the average position of ISTJs and Type 9s along these dimensions of organizational style.
A comparison of ISTJs and Type 9s along organizational dimensions. The blue dot shows the average position of ISTJs, and the blue circle shows where roughly 50% of ISTJs fall in organizational space. The orange dot and circle show similar positions for Type 9s.
ISTJs are usually systematic and highly organized. They like setting big, long-term goals and then creating detailed plans to accomplish them. ISTJs are generally good at ignoring distractions and making steady progress through consistent routines and habits.
Type 9s thrive in unstructured environments with fewer constraints and more room for improvisation and serendipity. They generally focus on enjoying the present rather than preparing for the future. Type 9s highly value spontaneity and the flexibility to change their mind, and they resist setting hard deadlines or rigid expectations.
As with most ISTJs, you and many Type 9s can clash over your need to set goals and use time efficiently. While you have an easier time getting down to work and staying focused, your Type 9 counterpart may be more easily distracted and unpredictable. Working consistently with a narrow focus often comes naturally to many ISTJs like you, but you may find that Type 9s benefit from additional structure to keep them on track. While you enjoy planning and tend to mind the future, your Type 9 counterpart helps you enjoy the present, injecting some much-needed spontaneity into your schedule.
A second difference between ISTJs and Type 9s is in their relative need for order, structure, and regularity. While you and most ISTJs thrive on well-defined systems and consistent organization, your Type 9 counterpart often feels overly constrained and bogged down by too much structure. They are more comfortable with chaos and are happy to take life as it comes, whereas you try to create order, routine, and predictability. Your differences in tidiness, punctuality, and compliance with social expectations may occasionally create conflict, too.
How to Identify Your Personality Types
Most people have complex personalities, and they don’t fit perfectly into a single personality type.
With TraitLab’s comprehensive analyses of your traits, strengths, and interests, you can see how your personality compares to every type from the Enneagram and 16 Personality typologies. Start building your personality profile by creating a free account today.
ISTJ Compatibility with Other Enneagram Types
For comparisons between ISTJs and other Enneagram types, visit any of the type pairings below:
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