MBTI vs JPI™-3: A Comparison of Personality Assessments

Personality assessments are tools designed to evaluate and understand various aspects of an individual’s character and behavioral tendencies. By measuring different personality traits or types, these tools can provide valuable information that supports personal growth, enhances workplace relationships, and optimizes job performance.

The Myers-Briggs Type Indicator (MBTI) and the Jackson Personality Inventory™-3 (JPI™-3) measure personality in fundamentally different ways. The MBTI groups people into one of 16 personality types based on their preferences across four areas of personality. In contrast, the JPI-3 measures personality on a series of scales, providing scores for seven broad personality dimensions and 42 distinct traits. Rather than placing people into categories, it shows how strongly each trait applies to an individual.  

The two assessments serve different purposes. The MBTI is primarily used to increase individual self-awareness and team communication, while the JPI-3 is designed for organizational applications including hiring, employee selection, and data-driven personnel decisions. Understanding these differences is essential when selecting a personality assessment. This article compares the MBTI and JPI-3, explains how each assessment works, and outlines the situations in which each is most appropriate

What is the JPI-3?

The JPI-3 is a comprehensive, scientifically grounded personality assessment tool used in industrial-organizational psychology and workplace applications. It builds upon the foundations of the Personality Research Form (PRF),¹ the Five-Factor Model,² and the HEXACO model.³ The JPI-3 assesses both broad personality factors, which are overarching dimensions of personality, and narrow personality traits, which are specific characteristics under each broad factor. Together, these results provide insight into an individual’s behavior and likely performance across a wide range of situations.

The JPI-3’s broad personality factors include:

Each of these broad factors is measured by six personality traits, or facets, which are representative of the components of personality covered by the broad factor. For example, the broad factor of Industriousness includes the following six facets:

1. Achievement
2. Competitiveness
3. Energy Level
4. Engagement
5. Hard-Working
6. Persistence

These facets are measured by subscales which consist of statements (also referred to as “items”) that test-takers rate on a 5-point scale, tied to how strongly they identify with each item. Results are presented on a continuum of scores, reflecting the degree to which the test-taker exhibits each trait. The JPI-3 is, therefore, a continuous measure of personality, offering greater sensitivity and nuance than typological models..

What is the MBTI Personality Test?

The Myers-Briggs Type Indicator (MBTI) is an assessment inspired by Carl Jung’s theory of psychological types.⁴ It is commonly used in career development, team building, and self-reflection contexts. Unlike assessments that measure personality traits on a continuum, the MBTI categorizes individuals into distinct personality types based on their preferences. Simply put, it is a typological measure of personality.

The MBTI groups individuals into one of 16 distinct personality types, determined by their preferences across four key dichotomies:

• Extraversion vs. Introversion
• Sensing vs. Intuition
• Thinking vs. Feeling
• Judging vs. Perceiving

Responses are classified into two distinct categories, such that individuals are either “Extraverted” or “Introverted,” or “Thinking” or “Feeling,” and so on.

Typological vs. Continuous Personality Measures

A typological measure is personality assessment that groups individuals into distinct categories or types based on stated preferences. The MBTI is the most widely used typological measure, producing a four-letter type (e.g., ENFJ, INTJ) from 16 possible combinations. 

In contrast, a continuous measure is a personality assessment that scores individuals along a spectrum for each trait, reflecting the degree to which a characteristic is present. The JPI-3 is a continuous measure, producing numerical scores across 42 personality traits. 

MBTI vs. the JPI-3: Which Is Right for Your Organization?

MBTI Personality Assessment

As a typological measure of personality, the MBTI categorizes individuals into distinct personality types and is most effective as a development and self-awareness tool for employees.

Common MBTI Use Cases in Organizations

It can be useful in situations such as:

• Aiding leaders in discovering how to manage others effectively.
• Increasing insight and self-awareness into one’s own personality.
• Recognizing how individuals’ unique combination of traits, values, and motivations may influence their behavior.
• Facilitating team building workshops and organizational training sessions focused on communication styles. 
• Supporting leadership development and coaching programs. 

While the MBTI provides a simplified personality framework that is easy to understand and communicate, it is important to recognize that human personality is complex, dimensional, and not easily reduced to fixed categories.⁵ 

Scientific Validity and Predictive Limitations of MBTI

The accuracy and validity of a personality scale is contingent on its empirical grounding and ability to predict important work-related outcomes.⁶ However, there is little-to-no empirical research supporting typological measures such as the MBTI, especially their ability to predict job performance. As such, using the MBTI in administrative decisions and prediction of employee behavior is highly discouraged.^7,8

JPI-3 Personality Assessment

Unlike typological assessments, the JPI-3 assesses specific traits along a continuum, offering a more detailed and accurate picture of personality.

Organizational Applications of the JPI-3

The JPI-3 is widely used in evidence-based HR decision-making, employee selection systems, and organizational development programs, including:

• Hiring and selection processes.
• Administrative decisions regarding employees.
• Prediction of employee behavior, such as truancy.
• Identifying strengths and areas for improvement.
• Workforce analytics and organizational benchmarking.
  

Why Continuous Personality Measurement Matters

Instead of categorizing people into types, the JPI-3 provides numerical scores that reflect where an individual falls on a range for each personality trait, allowing for:

• Greater measurement precision and sensitivity. 
• More accurate comparison between candidates. 
• Data-driven workforce segmentation. 
• Improved prediction of workplace performance outcomes. 

This approach offers more detail than simply assigning a trait label. The assessment also includes standardized scores, making it easy to see whether someone scores low, average, or high on a given trait.

Workplace Relevance and Predictive Insights

These comparison-based insights are particularly valuable in situations where precision is essential, such as in hiring decisions. For example, understanding traits associated with counterproductive work behaviors, such as low scores on the Honesty/Humility scale, can provide deeper insights into employee behavior and inform strategies to mitigate negative outcomes. In organizational settings, the JPI-3’s detailed reporting of traits like Self-Discipline, Engagement, and Hard-Working can provide meaningful perspectives into a potential employee’s workplace behavior and organizational fit.^{9, 10, 11} This makes the JPI-3 highly effective for selection and recruitment.

How the MBTI and JPI-3 Handle Response Validity

Both the JPI-3 and the MBTI rely on honest self-reporting from test-takers, which introduces potential limitations such as:

• Social desirability bias.
• Impression management in high-stakes hiring contexts.
• Faking good or exaggerating positive traits during selection processes.

These challenges are particularly important in employment screening and organizational decision-making environments, where respondents may have incentives to manipulate responses.^{1, 2}

JPI-3 Response Validity and Impression Management Controls

In order to mitigate this limitation, the JPI-3 uses a collection of items within the measure for response validation, providing an index of impression management. Respondents with high scores on this scale are likely to claim highly desirable virtues that are rarely true. In such cases, the results should be validated with additional sources of information.

MBTI Limitations in Validity Detection

In contrast, the MBTI does not include validity scales to detect desirable responding, so the validity of an individual’s results cannot be verified. As a result, interpretation of results may be less reliable in high-stakes contexts such as hiring or promotion decisions.