What is the Myers-Briggs Type Indicator (MBTI)?
The Myers-Briggs Type Indicator (MBTI) is one of the world’s most widely used personality assessments. It classifies individuals into one of 16 distinct personality types based on their preferences across four dimensions. Developed by Katharine Cook Briggs and Isabel Briggs Myers and grounded in Carl Jung’s theory of psychological types, the MBTI is one of the most widely used personality tools in workplaces and educational settings. From team-building exercises to leadership coaching and career development, MBTI results are often used to support personal and professional growth. Despite its widespread use, many people are unfamiliar with how the assessment works or what the four personality type letters actually mean.
This article explains what the MBTI is, how it categorizes personality types, and why the tool is both popular and debated. It also outlines alternatives, including SIGMA’s Leadership Skills Profile – Revised® (LSP-R®), for organizations seeking a more evidence-based approach to personality and leadership assessment.
What is the MBTI?
The Myers-Briggs Type Indicator (MBTI) is a self-report assessment that groups test takers into 16 personality types based on their tendencies in four categorical dichotomies:
- Energy source: Extraversion (E) vs. Introversion (I)
- Information gathering: Sensing (S) vs. Intuition (N)
- Decision-making: Thinking (T) vs. Feeling (F)
- Lifestyle: Judging (J) vs. Perceiving (P)
The 16 types are also commonly grouped into four broader categories:
- Analysts (INTJ, INTP, ENTJ, ENTP)
- Diplomats (INFJ, INFP, ENFJ, ENFP)
- Sentinels (ISTJ, ISFJ, ESTJ, ESFJ)
- Explorers (ISTP, ISFP, ESTP, ESFP)
These groupings can help individuals quickly identify broad communication styles and working preferences within a team.
What Does MBTI Stand for?
MBTI stands for “Myers-Briggs Type Indicator”. The personality assessment is named after the developers, Katharine Cook Briggs and Isabel Briggs Myers, who based their work on Carl Jung’s theory of psychological types.
What Do the MBTI Letters Mean?
The MBTI personality test assigns letters that represent preferences for recharging, learning, decision-making, and general lifestyle:1
E stands for Extraversion. People who prefer Extraversion are energized by the outer world of people, activities, experiences, and things. They generally share their ideas verbally and “recharge” through interaction with other people.
I stands for Introversion. People who prefer Introversion tend to be energized by their inner world of thoughts, ideas, and reflection. They may use energy during social interaction and regain it through solitude. They usually prefer to think through their ideas privately before sharing them.
S stands for Sensing. People with a Sensing preference often focus on concrete information, observable details, and practical realities. They prefer to process information in a sequential, step-by-step way.
N stands for Intuition (because I is already used for Introversion). People who prefer Intuition tend to learn by focusing on the big picture, spotting themes and patterns, and connecting ideas.
T stands for Thinking. People who prefer Thinking tend to make decisions based by weighing logic, consistency, and likely consequences of decisions with an emphasis on objective analysis.
F stands for Feeling. People who prefer Feeling consider values and the impact of decisions on others, with a focus on harmonious interpersonal relations.
J stands for Judging. People who prefer Judging tend to be planners and list-makers who like structure and a clear schedule. They usually pace projects so the work gets done steadily over time.
P stands for Perceiving. People who prefer Perceiving often value flexibility and adaptability. They like to stay open to new opportunities, make decisions in the moment, and may even enjoy working close to a deadline or on their own schedule.
How Common is Each Personality Type?
The distribution of MBTI types in the United States, as of 2024, was as follows:2
| Personality Type | Percentage |
| ISFJ | 13.8% |
| ESFJ | 12.3% |
| ISTJ | 11.6% |
| ISFP | 8.8% |
| ESTJ | 8.7% |
| ESFP | 8.5% |
| ENFP | 8.1% |
| ISTP | 5.4% |
| INFP | 4.4% |
| ESTP | 4.3% |
| INTP | 3.3% |
| ENTP | 3.2% |
| ENFJ | 2.5% |
| INTJ | 2.1% |
| ENTJ | 1.8% |
| INFJ | 1.5% |
According to this personality type distribution table:
- The four most common types (ISFJ, ESFJ, ISTJ, ISFP) account for 46.5% of the population.
- The four rarest types (INFJ, ENTJ, INTJ, ENFJ) make up only 7.9% of the population.
- Sensing types (S) are significantly more prevalent than Intuitive types (N).
- Feeling types (F) are more common than Thinking types (T).
How Does the MBTI Work?
Each year, millions of people complete the MBTI. The assessment is used by individuals and organizations to support self-awareness, improve team communication, and explore career development. Key features include:
Categorization by Preference
There are four areas on which individuals are sorted. These four areas interact to produce 16 distinct profiles and each individual is placed into one profile based on their responses. The four areas are:
- Extraversion vs. Introversion
- Sensing vs. Intuition
- Thinking vs. Feeling
- Judging vs. Perceiving
Responses are dichotomously scored, such that individuals are either “Extraverted” or “Introverted,” “Thinking” or “Feeling,” and so on.
Results are Delivered by a Trained MBTI Administrator
The measure is restricted, so it can only be administered, scored, and interpreted by a trained MBTI administrator. While this increases the costs associated with personality testing, it also decreases the likelihood that the results will be misunderstood or misinterpreted.
The MBTI is designed to build awareness of preferences. It is not intended to predict job performance or to support employee selection decisions.
Is the Myers-Briggs Missing Something?
While the MBTI is popular among human resources (HR) professionals, it is frequently criticized by industrial and organizational (I-O) psychologists, who focus on scientific standards for workplace assessment, including validity and reliability.
In “Goodbye to MBTI, the Fad That Won’t Die”, Dr. Adam Grant questions the validity, reliability, and comprehensiveness of the MBTI and likens it to “a physical exam that ignores your torso and one of your arms.” Lillian Cunningham summarizes academic critiques in “Myers-Briggs: Does it pay to know your type?” noting concerns that MBTI use can resemble belief more than evidence and that interpretation is often delivered by practitioners without formal training in psychological science.
A central criticism of the MBTI, as Grant explains, is that “four letters don’t do justice to anyone’s identity.” As Grant argues, personality is complex, and a four-letter type can miss meaningful variation within individuals. Research also shows that MBTI results can change if an individual retakes the assessment at a later stage of life, raising additional questions about its consistency as a measurement tool.
How Does the MBTI Compare to Other Personality Assessments?
The MBTI is a typological assessment that classifies individuals into discrete categories rather than measuring traits on a continuum. Typological assessments like the MBTI assign individuals to one type or category based on their responses. This makes results easy to communicate and remember, which is part of why these tools are popular for team building and self-awareness exercises. The trade-off is that placing people in discrete categories can oversimplify how personality actually works. Personality traits exist on a spectrum, and most individuals fall somewhere in the middle of each dimension rather than clearly at one end.
Continuous assessments, by contrast, measure how much of each trait an individual possesses rather than assigning them to a fixed category. Many continuous assessments, including SIGMA’s LSP-R, are grounded in established models of personality. Because these assessments produce a score on each trait individually, they provide a more nuanced and predictive picture of how a person is likely to perform, develop, and respond to different environments.
Which Assessment is Right for My Organization?
The right tool depends on the purpose. If the goal is building self-awareness or starting a team conversation about working styles, the MBTI can serve that purpose. If the goal is identifying high-potential leaders, guiding development planning, or informing promotion decisions, a validated continuous assessment is the more defensible choice.
Looking for More?
For organizations that want personality insights grounded in stronger psychometric evidence, validated alternatives may be a better fit. SIGMA’s flagship leadership assessment, the Leadership Skills Profile – Revised® (LSP-R®), is one option designed to support leadership development and talent decisions.
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- Melissa. (July 11, 2017). What do the letters in the Myers-Briggs test stand for? MBTI. Retrieved from https://www.mbtionline.com/en-US/Articles/what-do-the-letters-in-the-myers-briggs-test-stand-for. ↩︎
- E. Jacobs-Pinson. (November 26, 2024). Myers Briggs Statistics: The 16 Personality Types. Crown Counselling. Retreived from https://crowncounseling.com/statistics/myers-briggs/. ↩︎
