ISTJ-TD Manager Dark Type: Love, Work & Complete Guide

“I’m methodical and have a strong sense of responsibility, but for some reason I tend to feel anxious easily”
Do you have any experience that resonates with this?
If you’re an ISTJ-TD type, you should understand this complex feeling very well.

In meetings where everyone else is rushing to conclusions, you feel like you want to consider more details.
And even with work you’ve completed perfectly, you become anxious wondering “Is this really okay?”
On the other hand, sometimes you find yourself prioritizing “efficiency” over “correctness”.

In this article, we will deeply understand your inner self and provide hints for growth.
We will explain in detail everything from ISTJ-TD characteristics to tendencies in love and work.
Let’s explore together your “misunderstood strengths” and true potential.

Once again, personality researcher and author of Villain Encyclopedia, Tokiwa (@etokiwa999), will provide the explanation.
※We have developed the HEXACO-JP Personality Assessment! It has more scientific basis than MBTI. Tap below for details.

Overview of HEXACO

What is HEXACO

Are you familiar with the new model “HEXACO” that allows for deeper understanding of human personality?
It can analyze aspects that weren’t visible in previous personality assessments.
This is a groundbreaking system that expresses human personality through six elements.
The six letters H・E・X・A・C・O each represent personality characteristics.

Specifically, it consists of the following elements:

• H: Honesty-Humility
• E: Emotionality
• X: eXtraversion
• A: Agreeableness
• C: Conscientiousness
• O: Openness

The revolutionary aspect of this model is the addition of the new perspective of “Honesty-Humility”.
Aspects of human nature that weren’t visible in the traditional Big Five model become clear.
Your complex personality can now be understood more accurately.
This helps you understand why your behavioral patterns emerge.

HEXACOとは？概要・遺伝・診断方法・MBTIとの関係を解説

64 Classifications by HEXACO

Each of the 6 elements is classified into 64 types based on high and low levels. Specifically, they are as follows:

• H: Honesty-Humility
  • High → Light (L: Light)
  • Low → Dark (D: Dark)
• E: Emotionality
  • High → Turbulent (T: Turbulence)
  • Low → Assertive (A: Assertiveness)
• X: eXtraversion
  • High → Extrovert (E: Extrovert)
  • Low → Introvert (I: Introvert)
• A: Agreeableness
  • High → Feeling (F: Feeling)
  • Low → Thinking (T: Thinking)
• C: Conscientiousness
  • High → (J: Judging)
  • Low → (P: Prospecting)
• O: Openness
  • High → Intuitive (N: iNtuitive)
  • Low → Sensor (S: Sensor)

These are connected like 16personalities to express types. Now let’s introduce the various types!

What is ISTJ-T (Logistician・Cautious Type)?

ISTJ-T is a type with low extraversion (I), low openness (S), low agreeableness (T), high conscientiousness (J), and high neuroticism (T) in the Big Five. Characteristics:

• Strong sense of responsibility and perfectionism
• Attention to detail and accuracy
• Attachment to tradition and order
• Self-critical tendencies
• Stress from uncertainty

They set high standards and work diligently to achieve them. However, they often have doubts about their own abilities and decisions. They make judgments based on logical thinking and experience, but it may take time to adapt to new situations.

In interpersonal relationships, they value reliability and consistency, but they also harbor anxiety about not being able to meet others’ expectations. They tend to feel stressed by change and uncertainty, but this can also become a driving force for growth.

ISTJ-T(管理者・慎重型)を論文10本以上で科学的に解説

Characteristics of ISTJ-TD

Characteristic ① “Steady and Meticulous”

Don’t you feel reassured when organizing things properly and proceeding according to plan?
ISTJ-TD individuals plan meticulously down to the smallest details, like skilled architects.
They pay attention to aspects that others might think “you don’t need to go that far.”

This steadiness tends to manifest in the following ways:

• An attitude that values discipline
• Strong sense of responsibility
• Tendency to respect traditions and customs

However, this meticulousness may sometimes be perceived by others as “inflexible.”
You might be too cautious about new ideas or prioritize logic over emotions.
But these are actually manifestations of your strength in “valuing certainty.”

In other words, your steadiness is like a “lighthouse” that people can rely on in a chaotic world.

Characteristic ② “High Tendency Toward Anxiety”

Do you ever have the thought “Is this really going to be okay?” cross your mind?
Even when you’ve prepared perfectly, you might feel anxious somewhere in your heart.
This is not a weakness at all, but rather a manifestation of the valuable trait of “cautiousness.”

This anxiety tendency may appear in the following situations:

• Excessive worrying
• Perfectionist behavior
• Taking time to make decisions

In reality, this trait brings many advantages.
You excel at discovering risks that others overlook and preventing problems before they occur.
Additionally, through careful consideration, you can produce higher-quality results.

In essence, your anxiety functions as a valuable ability called “foresight.”

Characteristic ③ “Tendency to Emphasize Practicality”

You may have a tendency to seek “realistic solutions rather than idealistic theories.”
When people around you are having emotional discussions, don’t you think “So, what should we actually do to solve this?”
This shows that you excel at seeing through to the essence of things.

This characteristic may manifest in the following ways:

• Efficient approaches to achieving objectives
• Attitude of prioritizing logical judgment
• Tendency to value substance over social formalities

However, this realistic attitude may sometimes appear “cold” to others.
But this trait of yours is also a valuable ability to make calm judgments in difficult situations.
It also leads to innovative thinking that eliminates waste and finds efficient solutions.

Ultimately, your pragmatism is the source of realistic and sustainable results.

Strengths and Weaknesses of ISTJ-TD

Strengths of ISTJ-TD

What you consider “normal” might actually be a strength that is highly valued by those around you.
Keeping promises, meeting deadlines, maintaining quality—these are not “natural” things.
Your sense of responsibility and efficiency are valuable qualities that many people wish to acquire.

The typical strengths of ISTJ-TD individuals are as follows:

• Attention to detail
• Disciplined nature
• High reliability

Furthermore, you excel at realistic and practical approaches.
For problems that cannot be solved with ideals alone, you can present concrete and feasible solutions.
You also possess a long-term perspective and the patience to continue making sustained efforts.

Above all, you take pride in your work and have the strength to never give up until the end.
Even in difficult situations, your attitude of steadily moving forward will give peace of mind to those around you.
Your sincerity and dedicated attitude will surely come back to you in the form of trust.

In essence, you are the “trustworthy presence” most sought after in our chaotic modern society.

Weaknesses of ISTJ-TD

Have you ever wondered, “Why do people around me ask for such sudden changes?”
Your cautiousness and planning ability are great strengths, but sometimes they can become challenges in rapidly changing environments.
However, these “weaknesses” are actually “misunderstood strengths” when viewed from a different perspective.

The challenges that ISTJ-TD individuals tend to face include the following:

• Lack of flexibility
• Difficulty expressing emotions
• Insufficient consideration for others’ emotions

Additionally, your high anxiety tendency may sometimes cause you to hesitate in taking action.
The thought “What if I fail?” may be so strong that you avoid new challenges.
Furthermore, perfectionist tendencies may cause you to worry excessively about minor mistakes.

Moreover, by prioritizing logic too much, you may sometimes disregard others’ emotions.
In trying to convey “what’s right,” you may lack consideration for “how to convey it.”
However, by viewing these as growth opportunities, you can surely become a more attractive person.

In other words, these challenges are also hints for your further growth.

ISTJ-TD Romantic Relationship Tendencies and Improvement Strategies

ISTJ-TD Romantic Tendencies

“Could I envision a future with this person?”──You may tend to think with such a long-term perspective even in romance.
You likely value building stable, trusting relationships over temporary passion.
This can be described as an attitude of carefully evaluating partners, much like choosing important friends.

The characteristics of ISTJ-TD individuals in romance are as follows:

• Cautious approach to romance
• Emphasis on stability
• Long-term relationship orientation

Also, you tend to show affection to your partner through “actions rather than words.”
You provide small daily considerations rather than surprises, reliable support rather than sweet words.
However, you often think “I wish they would understand,” and may struggle with directly expressing your feelings.

Furthermore, even in romance, you easily feel anxiety about “What if I fail?”
You may become too cautious about relationship progression and miss opportunities.
However, once you build trust, you become the most sincere and reliable partner.

Ultimately, you are a sincere person seriously looking for “someone to spend a lifetime with.”

理想の彼氏彼女はどんな性格？恋愛占いよりも当たる

When Problems Arise in Romance and Improvement Strategies

“Why doesn’t my partner understand my feelings?” Have you ever felt this way?
Even if you cherish someone deeply in your heart, it may not be conveyed to your partner.
Also, when your partner becomes emotional, you may struggle with how to respond appropriately.

Common problems in romance and improvement strategies are as follows:

• Lack of emotional expression → Consciously verbalize “thank you” and “I’m happy”
• Lack of flexibility → Try accepting your partner’s suggestions with “That sounds interesting”
• Excessive anxiety → Share your worries with your partner and think of solutions together

Furthermore, by emphasizing practicality too much, you may sometimes disregard your partner’s “dreams” or “ideals.”
Before saying “That’s not realistic,” try first empathizing with your partner’s feelings.
Also, it’s important not to seek perfection too much and to have room to enjoy each other’s growth.

Additionally, it’s important not to fear new experiences and try challenging things together with your partner.
By stepping slightly out of your comfort zone, new winds will blow into the relationship.
Try becoming an explorer who ventures into unknown worlds according to your partner’s hobbies and interests.

In essence, expressing your affection in “visible forms” is the key to deepening relationships.

MBTIと恋愛：全16タイプの傾向・問題点・改善策を公式解説

ISTJ-TD Friendship Tendencies and Improvement Strategies

Friendship Tendencies

“Quality over quantity in friends”──Don’t you deeply resonate with these words?
You tend to value a few truly trustworthy friends over many acquaintances.
You’re the type who deepens friendships over a long time, like carefully tending bonsai trees.

The characteristics of ISTJ-TD individuals in friendships are as follows:

• High reliability
• Small circle of close friends
• Strict adherence to promises and obligations

Also, you tend to expect the same values and sense of responsibility from your friends as you have yourself.
You likely prioritize building relationships with people you can be confident “won’t betray me.”
However, this strict selection process may sometimes narrow the scope of new human relationships.

Furthermore, you often show affection for friends through “actions.”
You provide practical help when they’re in trouble or quietly support them when needed.
However, this pragmatic approach may sometimes be misunderstood as “lacking warmth.”

In other words, you are a valuable friend who is “truly reliable when in real trouble.”

友達の作り方や満足度が性格タイプで違う？論文を解説

When Problems Arise in Friendships and Improvement Strategies

Have you ever wondered, “Why are my friends so unplanned and impulsive in their actions?”
Your steadiness is a wonderful strength, but sometimes it might give friends the impression that you’re “rigid.”
Additionally, your tendency to prioritize logic over emotion may sometimes create emotional distance with friends.

Common problems you might face in friendships and their improvement strategies are as follows:

• Lack of flexibility → Try saying “Let’s give it a try” to friends’ sudden suggestions
• Difficulty expressing emotions → Honestly express “That was fun” or “That really helped”
• Difficulty building new relationships → Try participating in places where you can start from common interests

Furthermore, your high anxiety tendency may sometimes prevent you from participating in new activities.
Try sharing your thoughts of “What if I fail?” with friends.
You might realize that many people harbor similar anxieties.

Additionally, your tendency to seek perfection may sometimes make you harsh toward friends’ failures.
Practice accepting that “people don’t need to be perfect.”
It’s important to focus on friends’ strengths and develop tolerance that accepts them including their shortcomings.

In essence, by adding “warmth” to your sincerity, you can become an even more attractive friend.

MBTIと友人関係：16タイプの傾向・問題点・改善策を公式解説

ISTJ-TD Parenting Tendencies and Improvement Strategies

Parenting Tendencies

“I want my children to grow up to be proper adults” – you might harbor such feelings.
In parenting as well, you tend to value planning and discipline.
Like a skilled craftsman training an apprentice, you’ll try to instill responsibility and independence in your children.

The characteristics of ISTJ-TD parenting are as follows:

• Consistent and strict discipline
• Emphasis on teaching practical skills
• Setting clear rules and expectations

Furthermore, you excel at objectively evaluating your children’s growth.
You promote children’s development by specifically praising learning achievements and behavioral improvements.
However, this utilitarian approach sometimes puts consideration for children’s emotional aspects on the back burner.

Also, you tend to prioritize your children’s safety and health above all.
Your attitude of detecting risks in advance and trying to protect children from danger is admirable.
However, worrying too much may sometimes limit children’s adventurous spirit and curiosity.

In other words, you are a responsible parent who “seriously considers your children’s future.”

子育てをする理想の親の性格とは？心理学の論文を解説

When Problems Arise in Parenting and Improvement Strategies

Do you ever feel, “Why won’t my children listen to what I say?”
Your disciplined approach is important, but sometimes it might feel restrictive to children.
You may also feel confused about how to respond when children become emotional.

Common problems you might face in parenting and their improvement strategies are as follows:

• Excessive strictness → Sometimes it’s important to relax rules by saying “today is special”
• Lack of emotional expression → Express “I love you” and “I’m proud of you” in words
• Excessive expectations → Increase opportunities to acknowledge and praise children’s “present”

Furthermore, your high anxiety tendency may sometimes excessively restrict children’s challenges.
Understand that “learning from failure” is also an important experience, and try to allow moderate risks.
It’s also important to avoid seeking perfection and acknowledge children’s efforts and improvements.

Additionally, focusing too much on practicality may sometimes lead to neglecting children’s creativity and dreams.
Before saying “Will that be useful in the future?”, try to understand your children’s interests and passions.
Sometimes enjoying “useless” play together can deepen the parent-child bond.

In essence, adding “flexibility” and “warmth” to your sense of responsibility is the key to improving parenting.

MBTIと子育て：全16タイプの傾向・問題点・改善策を公式解説

ISTJ-TD Career Tendencies and Improvement Strategies

Career Tendencies

“I want to work long-term in a stable workplace” – don’t you hold such values?
Rather than repeatedly changing jobs, you tend to prefer steadily honing your skills and building trust within one organization.
Like an old tree, you’re the type who grows steadily by putting down deep roots.

The characteristics of ISTJ-TD individuals in their careers are as follows:

• Aptitude for traditional professions
• Emphasis on long-term employment relationships
• Focus on improving practical skills

Furthermore, you excel in fields that require detailed work and accuracy.
You will truly shine in professions where “mistakes cannot be tolerated,” such as accounting, legal affairs, and quality control.
However, you may struggle in positions that require creative thinking or flexible responses.

Additionally, you tend to aim for management positions or leadership roles.
Your strong sense of responsibility and high reliability will be highly valued as a leader.
However, you may easily feel stressed in rapidly changing industries or environments with many ambiguous instructions.

In other words, you are an indispensable presence that “supports the foundation of the organization.”

キャリアが上手くいく性格は？転職の前に性格診断！論文解説

When Problems Arise in Career and Improvement Strategies

Have you ever felt “Why does my boss keep changing policies again?”
Your stability-oriented nature is a great strength, but it can also become a challenge in today’s rapidly changing business environment.
Also, by prioritizing logic too much, you may find that emotional connections with colleagues become thin.

The problems you’re likely to face in your career and improvement strategies are as follows:

• Resistance to change → Try viewing new skill acquisition as an “investment”
• Lack of communication → Be conscious of casual conversations with colleagues and expressing gratitude
• Risk avoidance tendency → Start gradually with small challenges

Furthermore, your high anxiety tendency may cause you to hesitate when it comes to promotions or challenging new projects.
Try sharing your concerns about “possibly being unprepared” with trusted colleagues or supervisors.
Also, finding a mentor to get advice about career direction can be effective.

Additionally, by prioritizing practicality too much, you may sometimes neglect team morale or workplace atmosphere.
Develop a habit of considering not just efficiency, but also colleagues’ feelings and workplace relationships.
Sometimes communication that appears “inefficient” can create great value in the long term.

In essence, adding “adaptability” and “interpersonal skills” to your steadiness is the key to career development.

MBTIとキャリア：16タイプの傾向・問題点・改善策を公式解説

ISTJ-TD Work Tendencies and Improvement Strategies

Work Tendencies

“Absolutely meet deadlines” “Never compromise on quality” – Don’t you have this kind of craftsman spirit?
You have an attitude of taking responsibility for assigned tasks until the very end.
You tend to demonstrate precise and efficient work performance, like a precision machine.

The characteristics of ISTJ-TD individuals in work are as follows:

• Attention to detail
• Disciplined work attitude
• Practical approach

Furthermore, you are skilled at thinking “How can this be solved?”
You not only theorize but also formulate actually executable plans and implement them steadily.
However, you may feel uncomfortable with tasks that require creativity or innovative ideas.

Also, you perform best in environments with clear instructions and expectations.
When “what should be done” is clear, you can maximize your abilities.
However, you may find it difficult to adapt to ambiguous situations or frequent policy changes.

In other words, you are a reliable professional who “consistently delivers results.”

仕事ができる人の性格とは？55万人以上の大規模調査を解説

When Problems Arise at Work and Improvement Strategies

Do you ever feel “Why does the team rush to make decisions when consideration is still insufficient?”
Your cautiousness and commitment to quality are wonderful traits, but they may sometimes slow down team progress.
Also, your attitude of prioritizing logic over emotions may affect coordination with colleagues.

The problems you’re likely to face at work and improvement strategies are as follows:

• Resistance to change → Adopt an attitude of trying new methods as “experiments”
• Lack of communication → Regularly share progress and challenges with colleagues
• Excessive perfectionism → Share work at 80% completion once and get feedback

Furthermore, your high anxiety tendency may cause you to postpone important decision-making.
Even when you feel “there’s insufficient information,” sometimes you need the courage to make judgments based on current information.
Also, learning stress management techniques to control pressure effectively is important.

Additionally, by prioritizing practicality too much, you may sometimes undervalue your team’s creativity or diverse opinions.
Before immediately judging “that’s not realistic,” try to understand the other person’s idea first.
Sometimes innovative solutions can emerge from “unrealistic” ideas.

In short, combining “flexibility” and “cooperation” with your reliability will lead to improvements in your work.

MBTIと仕事：全16タイプの傾向・問題点・改善策を公式解説

Compatible Types for ISTJ-TD

Compatible Types: People Who Include S

Haven’t you encountered someone and felt “I really connect with this person”?
Perhaps that person might be someone of the same S type (Sensing) as you.
In relationships with people you can have realistic and practical conversations with, there’s a tendency for both parties to feel a sense of security.

The reasons for good compatibility with S types are as follows:

• Shared realistic worldview
• Concrete and practical communication style
• Emphasis on stability and reliability

Particularly with types like ISTJ or ESFJ, you can build relationships like old friends.
Because your values and behavior patterns are similar, it’s easy to understand each other.
However, precisely because you’re too similar, there may be fewer opportunities for new stimulation and growth.

Also, S-type people understand your anxieties and think of concrete solutions together with you.
Rather than saying “you worry too much,” they’re reliable people who suggest “how about this approach?”
Furthermore, they may help you notice ethical aspects that you sometimes overlook.

In other words, with S-type people, you can build valuable relationships where you can “speak honestly with peace of mind.”

友達の性格はどこが似てる？相性のいい人の探し方を解説

Compatible Types: People Who Emphasize Practicality

Have you ever met someone and thought “this person gets to the point quickly, which is great”?
In relationships with people who emphasize efficiency and results, you can build meaningful cooperative relationships without wasting time.
There’s a tendency for both parties to communicate clearly about “what should be done” and “how to proceed.”

The reasons for good compatibility with people who emphasize practicality are as follows:

• Shared goal orientation
• Clear communication style
• Results-focused attitude

Particularly with people who demonstrate leadership, you can display excellent teamwork.
A role division naturally emerges where the other person shows the big picture direction and you plan and execute the details.
You can build cooperative relationships that utilize each other’s expertise, like an architect and craftsperson.

Also, people who emphasize practicality appreciate your cautiousness as “planning ability.”
Rather than criticizing you as “too cautious,” they understand it as “high risk management ability.”
Furthermore, when you’re feeling anxious, they tend to provide concrete support and encouragement.

In essence, with people who emphasize practicality, you can build ideal partnerships where you “leverage each other’s strengths.”

MBTIと相性：全16タイプの良い友達や恋人を論文をもとに解説

ISTJ-TD Summary

The fact that you’ve read this far probably means you wish to understand yourself more deeply.
As an ISTJ-TD, you are reliable, highly responsible, and someone others can depend on.
Your attention to detail and logical thinking ability are precious talents that many people admire.

The main characteristics of ISTJ-TD can be summarized as follows:

• High sense of responsibility and efficiency
• Attention to detail
• High tendency toward anxiety
• Practicality-focused attitude

On the other hand, we’ve learned that there are also challenges such as adapting to change and emotional expression.
However, these are definitely not “flaws” but rather guideposts for growth.
Your high anxiety tendency and practicality-focused attitude can become great strengths when viewed differently.

Hints for growth lie in the following points:

• Improving flexibility
• Strengthening emotional expression
• Controlling anxiety
• Awareness of consideration for others

By understanding your “misunderstood strengths” and gradually working on these challenges,
you can become a more attractive and influential person.
Also, through relationships with S types (Sensing) and people who emphasize practicality,
you can rediscover your own good qualities and complement each other’s lacking areas.

Ultimately, as an ISTJ-TD, you are someone who can fully demonstrate your wonderful potential
by deepening your self-understanding and continuing to grow continuously.

FAQや注意点

HAXACOの結果と、16personalities（通称MBTI診断）やMBTI（本家）と結果が変わる

1. 性格は遺伝と環境の影響を受けるため、環境が変われば回答も変わります（例、疲れてると情動性が変化するなど）。遺伝について詳しくはこちら。
2. 年齢次第で回答のブレがあります。詳しくはこちら。
3. タイプ分類は各数値が3以上、3未満で行っているため、3に近い値だと、質問の聞き方やその時の環境次第で結果が変わりやすくなります。タイプよりも数値を見てください。
4. MBTI（本家）や16personalities（通称MBTI診断）は質問設計の段階でどの程度統計的な処理をしているか論文が見当たらないため不明確です。一方で、ビッグファイブやHEXACOはそういった論文が簡単に見つかりますし、今回のHEXACO-JP診断は論文ベースです。
5. MBTIや16personalitiesは普段の行動（学力・年収など）や、脳・遺伝などとの比較した研究論文があまり多くない一方で、ビッグファイブやHEXACOは数多く存在します。
6. そもそもHEXACOはビッグファイブの要素の変形なので似て非なるものです。HEXACOの正直・謙虚さは、ビッグファイブの協調性と神経症傾向から抽出されています。下記「補足」参考。

その他にもご質問があれば運営者のトキワ（@etokiwa999）までご連絡ください。

性格診断の結果はあくまで人生の「ヒント」まで

先にも書きましたが、性格は遺伝と環境の影響を受けます。遺伝の影響で、ブレ幅は一定ですが、環境次第である程度答えがブレます。

またビッグファイブやHEXACOの研究論文では学力や年収などと相関分析をしていますが、自然科学の実験ほど大きな相関係数ではありません。相関係数は最小-1、最大1ですが、だいたい-0.4～0.4ほどが多いです。もちろん高いものもあります。0.8や0.9ではなく、それに比べたら低いです。

ただそれでも様々な研究はありますので、「占い以上、自然科学未満」と思ってください。心理学や占いを100％否定しているわけではありません。

補足

16personalities（通称MBTI診断）の概要

16personalities（16タイプ性格診断）は、MBTI（Myers-Briggs Type Indicator）とビッグファイブをベースにして作られています。

厳密には16personalitiesとMBTIは別物なのです。

MBTIは、ユングの心理学的類型論を基に開発された性格診断ツールです。

16personalitiesはMBTIの4つの指標（E外向-I内向、S感覚-N直観、T思考-F感情、J判断-P知覚）を採用しつつ、アイデンティティ（AとT）という指標の追加、独自の質問項目・評価基準を設けています。

この性格診断の良いところとしては、韓国アイドルが広めたり、恋愛マッチングアプリでも使われたりするなど、とても有名で、回答数がとても多いことにあります。それを利用して分析して論文として公開すれば信頼性は高いかもしれません。

ただし、悪いところとしては、科学的な裏付けが弱いところがあります。査読付き論文の数が少ない、統計処理の方法が不明確、性格と学力・収入・脳機能・遺伝的要因などとの関連性について十分な根拠が提示されていない、などが理由です。

16personalitiesとは？科学的根拠やMBTIとの違いを解説

MBTI（本家）の概要

MBTIは性格を16タイプに分類する心理学の理論です。

そもそもMBTIとは、マイヤーズ・ブリッグス・タイプ・インジケーター（Myers-Briggs Type Indicator）の略称です。

MBTIでは、以下の4つの指標を組み合わせて性格を16タイプに分類します。

• 外向性（Extraversion）か内向性（Introversion）
• 感覚（Sensing）か直観（iNtuition）
• 思考（Thinking）か感情（Feeling）
• 判断（Judging）か知覚（Perceiving）

つまり、MBTIでは自分の性格傾向を「ISTJ」や「ENFP」などの4文字で表現するのです。

16personalitiesよりは論文は存在しますが、ビッグファイブやHEXACOほど頑健な研究結果が出ているわけではありません。

MBTIとは？16タイプ性格紹介(恋愛や仕事)・科学的根拠を解説

ビッグファイブの概要

性格心理学において最も有力な特性理論の一つが「ビッグファイブ（Big Five）」です。

ビッグファイブは、開放性、誠実性、外向性、協調性、神経症傾向の5つの特性を測定します。

また、16personalitiesやMBTIはタイプ分類（例、外向的か内向的かのどちらか）を用いるのに対して、ビッグファイブが特性を連続的な数値で評価する（例、外向性3.5）点も大きな違いです。

さらに、古くから研究されており、論文数も多く、学力や所得、脳や遺伝など、他の分野でも多くの研究が行われています。ビッグファイブの方が比較的、科学的な裏付けが強いと言えます。

ビッグファイブ(Big Five)診断とは？概要・遺伝・MBTIとの関連

MBTI・ビッグファイブ・HEXACOの相関関係

MBTIの4指標とビッグファイブの5因子には相関関係があります。

この相関を示した代表的な研究に、「The relationship between the revised NEO-Personality Inventory and the Myers-Briggs Type Indicator」という論文があります。

また、MBTI（本家）とビッグファイブを参考にして作られた16personalities（通称MBTI診断）では、ビッグファイブの神経症傾向が「アイデンティティ」と呼ばれており、自信（Assertive）か、慎重（Turbulent）かで分類されています。

これらの関係をまとめたのが以下の図です。

一番右には、比較的新しい性格診断である「HEXACO（ヘキサコ）」があります。ビッグファイブに1つ指標「正直・謙虚さ」を加えて改良され、ダーク特性（倫理観）が分かるようになりました。

今回のHEXACO-JP性格診断では16personalitiesの5文字に加えて、ダークD/ライトLを付けてより詳細に分析できるようにしています。