Personality Tests Aren’t Destiny

Personality assessments have become woven into the fabric of modern organizational life to the point that there's no avoiding them.

DiSC, Belbin, Myers-Briggs, and their cousins are often among the first tools we encounter as we enter the corporate world. They show up in onboarding sessions, leadership programs, recruitment processes, and executive classrooms, and that familiarity breeds acceptance just like their repeated use breeds expectation, to the point where not administering an assessment can feel like a missing ingredient.

What tends to get lost in this routine is that much of the personality testing industry rests on stilts rather than bedrock when it comes to scientific evidence. More concerning still, many people interpret their results as definitive descriptions of who they are, rather than as what the results actually represent.

That misunderstanding is where the real trouble begins.

The proper place for personality assessments

Many of the most widely used personality frameworks were never built through decades of cumulative, hypothesis-driven scientific research. The Myers-Briggs Type Indicator, for example, was developed by Katharine Briggs and Isabel Myers in the mid-twentieth century, drawing heavily on Carl Jung’s theory of psychological types. Neither had formal training in psychometrics, and the instrument was designed primarily for practical use in wartime United States rather than empirical rigor.

DiSC and similar tools followed a comparable path, emphasizing usability and intuitive appeal over careful validation. This does not make them useless by any means, but it does place them in a very different category than trait-based models such as the Big Five, which emerged from large-scale lexical and factor-analytic research programs.

Criticism of popular type-based assessments has been consistent for decades (e.g. Pittenger, 2005). Researchers have raised concerns about their weak test–retest reliability, meaning people often receive different results when they retake the same test. Others have pointed out problems with construct validity, including the use of sharp categorical distinctions where underlying traits appear continuous rather than binary (e.g. McCrae and Costa, 1989). Still others have noted the limited predictive power of these instruments when it comes to job performance or real-world behavior (e.g. Furnham and Crump, 2007).

None of this places personality tests in the same category as horoscopes, but just like horoscopes, many of their conclusions require a degree of prior belief to feel convincing.

And yet, even imprecise tools like these can be useful if we understand their limits.

The right way to use personality assessments is like using a broken ruler

You would never rely on it for accuracy, but you might still use it for comparison.

Applied consistently, such tools can highlight differences between people, prompt reflection, and open conversations about preferences, communication styles, and friction points within teams. Used this way, they become starting points rather than verdicts.

The danger lies in forgetting that they are broken, and the most damaging mistake people make with personality assessments is treating the results as destiny.

They are nothing of the sort.

Receiving a label like ENTJ or “low D” delivered with confidence can sound like a judgment, but at best it represents a snapshot taken under specific conditions, through a narrow lens, at a particular moment in time. Personality is far more dependent on social context than these labels suggest.

How we behave, react, and even think shifts depending on who we are with, what roles we occupy, and which environments draw certain tendencies out of us. Strip personality of its social context, and what remains often looks less like a stable essence and more like patterns of behavior that emerge in response to others.

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That is why it helps to keep three principles in mind whenever personality assessments enter the picture.

First, we contain multitudes. People routinely exhibit different personalities across contexts, languages, cultures, and roles. Singular labels compress that range into something that often reflects a default setting rather than the full bandwidth of who someone can be.

Second, we are poor narrators of our own personalities. Ask someone to define personality as “how I am,” and the definition collapses unless it is followed by “with and according to others.” Personality is a socially emergent phenomenon. When we examine our own personalities, we are often looking at mirrors rather than internal facts.

Finally, there is nothing final about the results. No assessment captures the full range of a person’s potential, nor is that its aim. Too often, however, results are treated as ceilings rather than tendencies. Instead of expanding possibilities, they quietly shrink them.

Personality tests can still have a place in organizational life, education, and self-reflection. But only if we resist the temptation to turn description into destiny.

Broken rulers can be useful tools; it's just that they make terrible compasses.