Are personality tests useless?

No. They are not useless for everything. CliftonStrengths can open productive conversations about how someone likes to work, what energizes them, and what kinds of projects engage them most. MBTI is useful for team communication discussions. The problem is when these tools are used to evaluate PM readiness or make level and promotion decisions, which is not what they were designed for.

What does an evidence-based PM assessment actually measure?

It measures behavioral evidence: specific decisions you made, the alternatives you rejected, the tradeoffs you navigated, and the outcomes you can tie to your choices. This is what a rigorous PM interview actually evaluates, and it maps to a PM-specific competency framework across all career levels.

Can I use my MBTI type to predict my PM performance?

The research does not support that. The correlation between MBTI type and job performance in the PM role specifically has not been established. Some of the most effective product leaders are introverts. Some are extroverts. The type itself does not predict the capability.

Why do so many companies still use personality tests?

Familiarity and ease of administration. Personality assessments are inexpensive, broadly understood, and feel objective. They also do not require the evaluator to do the harder work of actually assessing behavioral evidence. That convenience has sustained their use longer than their validity evidence would justify for PM-specific decisions.

VS. ALTERNATIVE

Why personality tests do not measure product leadership

Myers-Briggs, CliftonStrengths, DISC, and similar tools are not bad. They are misapplied. They describe how someone prefers to think and interact. They were not designed to evaluate what a product manager has actually demonstrated, what level they are operating at, or whether they are ready to take on more scope. Using them to make PM level and promotion decisions is the wrong instrument for the job.

Key takeaways

Personality tests measure how you tend to think, not what you have demonstrated. They were not designed to evaluate PM level or readiness.
Myers-Briggs and CliftonStrengths have no PM-specific level scale. A PM and a CPO with the same type or top theme get the same read.
MBTI has low test-retest reliability: many participants score differently on at least one dimension when retested weeks later.
What rigorous PM interviews actually evaluate: specific decisions you made, the alternatives you rejected, the tradeoffs you navigated, and the outcomes you can tie to them.
Personality assessments are useful for team communication discussions. The problem is using them to make PM level and promotion decisions, which is not what they were designed for.

Five reasons they fall short for PM evaluation

They measure how you think, not what you have done

Personality type classifies preferences: you tend toward Intuition over Sensing, or Thinking over Feeling. This describes a cognitive style, not a capability level. Two PMs can share the exact same type and have completely different track records on product strategy, execution, and customer judgment. A type description cannot distinguish them.

They have no level scale

Product management spans associate PM through CPO, across scope differences that are not personality-driven. A junior PM and a VP of Product with the same top CliftonStrengths theme are not at the same level. No personality tool has an equivalent of senior or director or principal because those are experience and evidence designations, not trait categories.

Test-retest reliability is low for MBTI specifically

Studies of MBTI retakes show that a meaningful percentage of participants (some research puts it above 50 percent) score differently on at least one dimension when retested weeks later. A tool whose output shifts on retesting is not measuring a stable underlying trait, which is what personality type implicitly claims to measure.

They conflate correlation with causation in strengths research

CliftonStrengths' own research shows that people who use their strengths are more engaged and perform better. That is a correlation. It does not mean that having "Strategic" as a top theme makes someone good at product strategy, or that a PM with "Relator" as a top theme will perform better on stakeholder management. The path from theme to competency is not established.

They are invisible to a rigorous hiring panel

A strong product interview at a rigorous tech company does not ask about Myers-Briggs type or top strengths themes. It asks for specific decisions, defended reasoning, and outcomes. Practicing for a personality assessment does not practice the skill that an interview actually evaluates.

What the alternative looks like

Behavioral evidence assessment evaluates specific decisions, their reasoning, and their outcomes. Not how you tend to think. Not what energizes you. Whether you can name a real prioritization tradeoff, explain why you rejected the alternatives, and connect the decision to a result. This is what rigorous PM interviews evaluate, and it is what separates PM level from PM title.

The 16 competency dimensions used here cover strategy, execution, leadership, and commercial judgment, with level-specific evidence requirements at each of the seven levels from PM through CPO. That is the kind of structure a personality type cannot provide, and the methodology explains exactly how evidence is evaluated within it.

Common questions

Are personality tests useless?: No. They are not useless for everything. CliftonStrengths can open productive conversations about how someone likes to work, what energizes them, and what kinds of projects engage them most. MBTI is useful for team communication discussions. The problem is when these tools are used to evaluate PM readiness or make level and promotion decisions, which is not what they were designed for.
What does an evidence-based PM assessment actually measure?: It measures behavioral evidence: specific decisions you made, the alternatives you rejected, the tradeoffs you navigated, and the outcomes you can tie to your choices. This is what a rigorous PM interview actually evaluates, and it maps to a PM-specific competency framework across all career levels.
Can I use my MBTI type to predict my PM performance?: The research does not support that. The correlation between MBTI type and job performance in the PM role specifically has not been established. Some of the most effective product leaders are introverts. Some are extroverts. The type itself does not predict the capability.
Why do so many companies still use personality tests?: Familiarity and ease of administration. Personality assessments are inexpensive, broadly understood, and feel objective. They also do not require the evaluator to do the harder work of actually assessing behavioral evidence. That convenience has sustained their use longer than their validity evidence would justify for PM-specific decisions.