Personality Tests at Work: Which Ones Are Worth Your Time

The best personality tests for professional use are those that produce consistent, actionable results rather than entertaining but unreliable snapshots. Myers-Briggs, DISC, Hogan, and the Big Five each serve different purposes, and choosing the wrong one for the wrong context wastes time and erodes trust in the process. If you are using personality assessments to build teams, improve communication, or inform hiring, the framework you choose matters more than most people realise.

This is not a ranking of which test gives the most flattering result. It is a practical breakdown of what each assessment actually measures, where it holds up, and where it falls apart.

Why Personality Tests Have Become a Business Fixture

Walk into almost any agency, consultancy, or corporate marketing team and you will find someone who has taken a personality assessment in the last twelve months. Sometimes it was part of onboarding. Sometimes a new manager brought one in. Sometimes it was a team-building day that needed structure.

I have been in rooms where the whole team has done Myers-Briggs and the results are pinned to the wall. I have also been in rooms where Hogan profiles shaped which candidates made it to final-stage interviews. The experience is very different, and so is the quality of the output.

The reason personality tests persist in business is not that they are perfect. It is that people are genuinely difficult to understand quickly, and organisations need tools that help them make faster, more defensible decisions about people. That need is real. The problem is that not every tool sold into that need is fit for purpose.

If you are building a go-to-market team, restructuring a marketing function, or trying to understand why two senior people keep talking past each other, a well-chosen assessment can surface things that months of meetings might not. But you have to start with the right framework. Much of what I write about in the broader context of go-to-market and growth strategy comes back to this: the quality of your team decisions shapes everything downstream.

What Makes a Personality Test Worth Using?

Before comparing individual tests, it is worth establishing what separates a useful assessment from an expensive distraction. There are two properties that matter most: reliability and validity.

Reliability means the test produces consistent results over time. If someone takes the same assessment six months apart and gets a completely different result, the test is not measuring anything stable. Validity means the test actually measures what it claims to measure, and that the results predict something meaningful in the real world.

Many popular assessments score well on face validity, meaning they feel accurate to the person taking them, but poorly on predictive validity, meaning they do not reliably predict job performance, leadership effectiveness, or team outcomes. That gap matters enormously if you are making consequential decisions based on the results.

A third factor worth considering is practitioner dependency. Some assessments are straightforward to self-administer and interpret. Others require trained practitioners to avoid misreading the output. Using a complex tool without the right expertise is like handing someone a balance sheet without explaining what working capital means.

Myers-Briggs: Popular, Persistent, and Overrated

Myers-Briggs Type Indicator, known as MBTI, is almost certainly the most widely recognised personality framework in the world. Millions of people take it every year. It produces a four-letter type, INTJ or ENFP or one of fourteen others, and it has built an entire cultural vocabulary around those labels.

The problem is that MBTI has significant reliability issues. A meaningful proportion of people who retake the test within a few weeks receive a different type. The framework forces people into binary categories on each dimension, which does not reflect how personality actually works. Most people fall somewhere in the middle of each spectrum, and the test treats them as one or the other.

That said, MBTI is not worthless. It is a decent conversation starter. It gives teams a shared vocabulary for discussing how people prefer to work, communicate, and make decisions. When I have used it in team settings, the value has come from the discussion it provokes, not from the four-letter result itself. People recognise something true in the descriptions, and that recognition opens a door.

Where MBTI breaks down is when organisations treat it as a hiring filter or a performance predictor. It was not designed for that, and the psychometric evidence does not support using it that way. If you are using MBTI to decide who gets promoted, you are using the wrong tool.

The Big Five: The Most Validated Framework You Have Probably Ignored

The Big Five, also known as OCEAN (Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism), is the most rigorously studied personality framework in academic psychology. Unlike MBTI, it measures traits on a continuous scale rather than forcing binary categorisation. It has strong test-retest reliability and a substantial body of evidence linking its dimensions to real-world outcomes including job performance, leadership effectiveness, and team cohesion.

Conscientiousness, in particular, is one of the most consistent predictors of job performance across roles and industries. Openness to experience tends to correlate with creative and strategic roles. Neuroticism, which measures emotional stability, has implications for performance under pressure.

The reason the Big Five has not captured the corporate imagination the way MBTI has is partly aesthetic. OCEAN does not produce a memorable label. There is no cultural shorthand. You cannot put it on a Slack profile. But that is a marketing problem, not a validity problem.

If you are serious about using personality data to inform people decisions, the Big Five is the most defensible starting point. Several commercial assessments are built on Big Five foundations, including some versions of Hogan, which we will come to shortly.

DISC: Useful for Communication, Misused for Hiring

DISC categorises people across four dimensions: Dominance, Influence, Steadiness, and Conscientiousness. It is widely used in sales training, team development, and communication workshops, and in those contexts it can be genuinely useful.

DISC is good at helping people understand how others prefer to receive information, how they make decisions, and how they respond to conflict. It is practical in the way that matters for day-to-day team dynamics. I have seen it used well in client-facing teams where understanding communication style differences was the actual problem being solved.

Where DISC becomes problematic is when organisations use it as a hiring filter. DISC was designed to describe behavioural tendencies in a given environment, not to predict performance or assess capability. Using it to screen candidates creates risk, both legal and practical, and the psychometric evidence for its predictive validity in hiring contexts is weak.

Used within an existing team to improve how people work together, DISC earns its place. Used to decide who gets hired, it does not.

Hogan Assessments: The Strongest Option for Leadership and Executive Contexts

Hogan Assessments are, in my experience, the most commercially serious personality tools available. They were built specifically for the workplace, grounded in Big Five theory, and designed to predict job performance rather than simply describe personality.

Hogan offers three core assessments. The Hogan Personality Inventory measures bright-side personality, the traits that show up when things are going well. The Hogan Development Survey measures dark-side tendencies, the behaviours that emerge under pressure or stress. The Motives, Values, Preferences Inventory measures what drives someone, what they want from work and life.

The dark-side assessment is particularly valuable for senior hiring and leadership development. Most personality tools only show you the version of someone that they present when they are at their best. Hogan’s development survey surfaces the derailers: the patterns that emerge when someone is stretched, stressed, or operating without oversight. For anyone who has watched a capable leader fall apart under pressure, that kind of insight has obvious value.

The trade-off is that Hogan requires trained practitioners to interpret the results properly. The reports are detailed and nuanced, and misreading them can do more damage than not using them at all. If you are considering Hogan for your organisation, the investment in qualified practitioners is not optional.

I have seen Hogan used well in executive team builds and leadership pipeline work. When the results are interpreted by someone who knows what they are looking at, and when the output is used to structure development conversations rather than make binary hire or no-hire decisions, it adds real value.

CliftonStrengths: A Different Question Entirely

CliftonStrengths, formerly StrengthsFinder, takes a different approach. Rather than measuring personality dimensions, it identifies your dominant talent themes from a taxonomy of 34. The premise is that you develop faster by building on strengths than by fixing weaknesses.

This is a philosophically different tool from the others on this list. It is not trying to predict performance or describe personality in a clinically rigorous way. It is trying to help people understand what they do well and find environments where those strengths are valued.

In team development contexts, CliftonStrengths can be useful for helping people articulate their contribution and understand where they complement each other. It tends to produce positive, forward-looking conversations, which has its own value when team morale or cohesion is the actual issue.

The limitation is that it tells you relatively little about how someone behaves under pressure, how they manage risk, or whether their values align with the organisation. For those questions, you need a different tool.

Enneagram: Useful for Self-Awareness, Not for Hiring

The Enneagram has grown significantly in popularity over the last decade, particularly in leadership coaching and personal development circles. It categorises people into nine types based on core motivations and fears, and at its best it produces genuinely insightful self-awareness.

The psychometric credentials of the Enneagram are, however, considerably weaker than the Big Five or Hogan. The reliability data is mixed, and the framework was developed outside the empirical research tradition that underpins the stronger assessments.

That does not make it useless. For coaching conversations, for personal development, and for helping leaders understand their own patterns, the Enneagram can be a productive lens. But it is not a tool I would use to inform hiring decisions or team composition in a commercially serious context.

How to Choose the Right Assessment for Your Context

The question is not which personality test is objectively best. The question is which tool is right for what you are trying to do. Here is a practical framework for thinking through that decision.

If you are trying to improve communication within an existing team, DISC or CliftonStrengths will give you a practical vocabulary and generate useful conversations without requiring significant investment in practitioner expertise.

If you are trying to inform senior hiring or build a leadership pipeline, Hogan is the most defensible option, provided you invest in trained practitioners. The output is richer and more predictive, but it requires more from the people interpreting it.

If you want a scientifically grounded baseline for team composition or development planning, look for assessments built on Big Five foundations. They are less culturally visible than MBTI but considerably more reliable.

If you are running a coaching programme or leadership development initiative focused on self-awareness, the Enneagram or CliftonStrengths can support those conversations well, particularly when the goal is personal insight rather than comparative assessment.

What I would caution against is using any single assessment as a definitive verdict on a person. Personality is not fixed. Context shapes behaviour. A tool that accurately describes how someone operates in one environment may not predict how they operate in another. The best use of any assessment is as one input among several, not as a standalone decision-making mechanism.

Early in my career I made the mistake of overweighting one signal when building teams. You find something that feels like a clean answer, and you lean on it harder than you should. The same instinct that leads marketers to over-index on lower-funnel performance data, because it is measurable and feels certain, shows up in people decisions too. The signal that is easiest to quantify is rarely the only one that matters.

The Organisational Mistake Most Companies Make With Assessments

The most common failure I see is not choosing the wrong assessment. It is doing nothing with the results.

Organisations invest time and money in personality assessments, run a workshop, share the results, and then file the reports. Six months later, the team is having the same communication breakdowns they were having before. The assessment became an event rather than a process.

The value of a personality assessment is not in the report. It is in the structured conversations the report enables, the changes in how people approach each other, and the decisions that get made differently as a result. Without that follow-through, even the most sophisticated tool is just an expensive icebreaker.

I have seen this in agency contexts specifically. A new leadership team comes in, everyone does Hogan or DISC, there is a facilitated session, and then it disappears. The people who ran the session move on, the reports sit in a shared drive, and nothing changes. The investment was real. The return was not.

If you are going to use personality assessments seriously, build them into a broader talent or team development process. Use the results in one-to-one development conversations. Reference them when you are restructuring teams or thinking about who should lead a particular project. Make them a living input rather than a one-time exercise.

The same principle applies across go-to-market planning. Tools and frameworks only produce value when they are connected to decisions and actions. If you want to go deeper on how this thinking applies to building high-performing marketing and GTM teams, the go-to-market and growth strategy hub covers the broader picture.

A Note on Diversity and the Risk of Over-Profiling

There is a real risk that personality assessments, used carelessly, reinforce homogeneity rather than build diversity. If you consistently hire people who score similarly on a given assessment, you end up with a team that thinks in similar ways, which feels efficient until it is not.

The most effective teams I have been part of or built have had genuine cognitive and behavioural diversity. People who process information differently, who challenge from different angles, who have different risk tolerances. That diversity creates friction, and friction creates better decisions, provided you have the leadership capability to channel it productively.

Personality assessments should help you understand that diversity and work with it, not screen it out. If your assessment process is consistently producing teams that look the same on paper, that is a signal worth paying attention to.

There is also a legal dimension worth noting. In many jurisdictions, using personality assessments as a primary hiring filter creates exposure, particularly if the assessment has not been validated for the specific role in question. Taking legal advice before embedding any assessment into a formal hiring process is not overcautious. It is sensible.

The Honest Summary

There is no single best personality test. There is a best test for a given purpose, used by people who understand its limitations, connected to a process that does something with the results.

If psychometric rigour matters to you, the Big Five and Hogan are the most defensible options. If practical team application matters more than academic validity, DISC and CliftonStrengths earn their place. If you want something that sparks self-awareness conversations, the Enneagram can do that job, with the caveat that its reliability credentials are weaker than the others.

What I would push back on is the idea that any of these tools is a shortcut to understanding people. They are lenses, not answers. The early part of my career taught me that the most important decisions, whether about clients, campaigns, or people, require you to sit with ambiguity rather than reach for the nearest clean framework. Personality assessments are useful. They are not a substitute for judgment.

That instinct, the one that reaches for a tidy label when the situation is actually complex, is the same one that leads marketing teams to over-index on the metrics that are easiest to measure rather than the ones that actually matter. The discipline is the same in both cases: use the tool, but do not let the tool do your thinking for you.

I remember the moment early at Cybercom when the founder handed me the whiteboard pen and left the room. There was no framework to hide behind. The room was watching. You either had something real to say or you did not. Personality assessments can tell you a lot about how someone might show up in that moment. They cannot tell you what they will actually say.

About the Author

Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what works.

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