Measurement, Categories & Structural Personality
Why Can Personality Test Results Change?
Two assessments can assign different scores, rankings, or profiles to the same person. That does not necessarily mean their personality has changed. A result also depends on the model being used, the questions being asked, and the rules used to turn responses into a profile.
I actively seek interaction and stimulating environments.
I speak up easily and assert my point of view.
01 — Every Test Begins by Choosing an Architecture
Not All Personality Tests Are Looking for the Same Thing
The word “personality” covers a very broad domain. Each model decides which differences it considers fundamental and how those differences should be organized.
Big Five
Big Five inventories typically distribute responses across five broad domains. But they do not all use the same items, the same length, or the same level of detail. The BFI-2, for example, measures five domains and fifteen facets, while its shorter forms trade some of that precision for speed.1
HEXACO
HEXACO offers a different six-dimensional map of personality: Honesty-Humility, Emotionality, Extraversion, Agreeableness, Conscientiousness, and Openness to Experience.2It is therefore not simply a graphical variation of the Big Five; it divides the space of individual differences in a different way.
another map
Typologies
A typology does more than report several scores: it combines them to assign a type, family, or dominant profile. This synthesis is easier to remember, but it also makes the result more sensitive to classification rules.
Different Results May Describe Different Levels
A Big Five score locates someone on broad dimensions. A HEXACO result applies a different factor structure. A typology instead looks for an overall configuration or structure. These results are therefore not directly interchangeable.
When someone receives two different portraits, the first question should not be “Which one is true?” but rather “Do these two instruments define personality in the same way and at the same level?”
02 — The Same Label Does Not Guarantee the Same Measure
Two Questionnaires Can Claim to Measure the Same Dimension Without Building It in the Same Way
A broad dimension such as extraversion can include several possible facets: sociability, energy, assertiveness, expressiveness, or stimulation-seeking. The questions selected determine which part of that dimension will carry the most weight in the score.
Focus on Sociability and Energy
dimension
label
Focus on Assertiveness and Leadership
Researchers have long compared Big Five inventories that differ in length and content. These instruments converge on broad domains, but their formats, facets, and predictive power are not identical.3
Questionnaire length also matters. A very short form may suit a large-scale survey while still providing a less detailed picture than a full inventory. In that case, the difference in results does not necessarily come from the person; it comes from the instrument’s level of resolution.
Small Variation
Two Nearly Identical Scores
03 — The Output Can Magnify a Tiny Difference
Score Stability and Label Stability Are Not the Same Thing
A continuous score can shift by a few points while remaining psychologically very similar. As soon as a threshold turns that score into a category, the same fluctuation becomes a visible change in letter, level, or profile.
Every observed score contains some margin of variation: no psychological instrument reproduces a perfectly fixed value mechanically.
When two scores fall on opposite sides of a threshold, they receive different labels despite being very close.
In a profile built from several dimensions, a single local shift can change the name of the overall result.
For its current instrument, The Myers-Briggs Company reports test–retest correlations ranging from 0.81 to 0.86 across the four scales over intervals of fifteen weeks or less. Yet only about half of participants receive exactly the same four-letter type again, while roughly 90% retain three or four of the same letters.4
These figures are not contradictory. The dimensions themselves can be fairly stable, while requiring all four classifications to be reproduced at once makes the full type easier to change.
04 — What Are We Really Trying to Recover from One Assessment to the Next?
The Same Number, the Same Label, or the Same Structural Personality?
Score Stability
The values remain close across two assessments. This reliability tells us something about the instrument, but it is not enough to define what personality is.
Label Stability
The same profile name is assigned. This stability depends both on the measurement itself and on the threshold, ranking, or combination rules.
Structural Profile Stability
The same fundamental personality is recognized behind different behaviors, skills, topics, and levels of maturity.
In the TypeInteractions model, personality is not a momentary snapshot of behavior. It is the invariant structural profile that organizes the way a person preferentially selects material and transforms it.
A person can learn, adapt, develop new skills, and integrate their blind spot more effectively. This development remains internal to the profile; it does not lead to a different structural personality.
TypeInteractions
Finding the Stable Personality Behind Its Changing Expressions
TypeInteractions starts from a precise hypothesis: the structural profile is the personality itself. It remains stable over time. What develops is the way that profile is expressed, managed, strengthened through new skills, and balanced against its limitations.
Changing Expressions
Situations, roles, vocabulary, reported behaviors, and the skills being used can all change.
Core Process
The analysis looks for the fundamental operation that transforms the material of the text: what the type naturally and spontaneously does with reality.
Invariant Structural Profile
The profile is the stable personality structure that defines the person’s own field of development.
The Invariant Structural Core
The core process, the dominant transformation, and the overall organization of the profile constitute the fundamental personality.
- preferred starting material
- dominant transformation
- preferred end form
- permanent structural profile
Development Within the Profile
A person can become more flexible, more capable, and more mature without leaving the structure that defines their personality.
- acquired skills and strategies
- more or less mature expressions
- adaptations to roles and situations
- better integration of the blind spot
What Stability Still Needs to Demonstrate
With the model and settings held constant, repeated analyses of the same text have shown differences small enough in internal testing to be considered operationally stable. The real scientific question is more demanding: do different texts written by the same person reveal the same structural profile? That hypothesis will need to be tested in a dedicated study, across multiple topics and time points.
A Stable Personality Does Not Mean a Static Person
The core process is defined as the transformation a type performs naturally, spontaneously, and preferentially. It provides a stable way of perceiving what matters and giving form to reality. Maturation does not replace this process; it allows the person to use it more accurately and avoid overapplying it.
The blind spot is the complementary transformation that the profile engages less spontaneously. Integrating it does not mean becoming another type. It means recognizing what the natural strength cannot produce on its own.
Distinguishing the Result from the Personality
A Result Can Change Even When the Structural Profile Has Not.
TypeInteractions seeks the invariant personality that durably organizes the way a person transforms what they express, while distinguishing that core from the behaviors and skills that develop over the course of life.
Key References
- Soto, C. J., & John, O. P. (2017). The Next Big Five Inventory (BFI-2): Developing and Assessing a Hierarchical Model With 15 Facets to Enhance Bandwidth, Fidelity, and Predictive Power. Journal of Personality and Social Psychology, 113(1), 117–143. View Source
- Lee, K., & Ashton, M. C. — The HEXACO Personality Inventory–Revised: official description of the six major dimensions. View Source
- Thalmayer, A. G., Saucier, G., & Eigenhuis, A. (2011). Comparative Validity of Brief to Medium-Length Big Five and Big Six Personality Questionnaires. Psychological Assessment, 23(4), 995–1009. View Source
- The Myers-Briggs Company. MBTI Facts — test–retest reliability of preference scales and the full four-letter type.View Source
- TypeInteractions theoretical documentation: core process, internal dynamics, sociability level, and blind spot.