Why Teams Need Better Assessment — And Why $24 Billion Says So

We assumed technology would reduce the complexity of working with people. It did the opposite.

Every organisation investing in AI, automation, and digital transformation is discovering the same thing. The tools get more powerful. The human questions get harder. Who decides? Who adapts when the system fails? Who takes responsibility when the algorithm is wrong?

One person cannot carry that anymore. The complexity of modern organisations has outgrown individual capacity — not because individuals got weaker, but because the systems got more intricate.

This is why teamwork is no longer a management principle. It is a performance prerequisite. And it is why understanding how people work together has become one of the fastest-growing investments organisations are making.

The Market Confirms It

The global personality assessment market was valued at US$ 10.68 billion in 2024. By 2031, it is projected to reach US$ 24.31 billion — a compound annual growth rate of 12.7%, according to The Insight Partners' 2025 market study.

That is not a niche trend. That is a structural shift.

North America currently holds the largest market share. Europe is the fastest-growing region, led by the UK, Germany, and the Netherlands. The European drivers are specific: organisations shifting from recruitment filtering toward development, talent optimisation, and understanding how diverse, multilingual teams actually function — what they produce together, not who sits in them.

The EU's focus on mental wellbeing and employee rights is pushing this further. Organisations increasingly need to understand what motivates people, what creates stress, and how individuals interact across different backgrounds and working styles. A traditional personality profile does not answer those questions well enough.

Any Assessment for Self-Reflection. A Different One for Teams.

Here is a distinction most organisations miss when they go looking for assessment tools.

Any serious assessment has value for self-reflection. MBTI, DISC, Big Five — these tools produce genuine insight for the individual. They describe preferences, tendencies, characteristic ways of processing and responding. For someone trying to understand themselves better, that has worth.

The question is what you are trying to solve.

If the question is "how do I understand myself better?" — almost any assessment helps.

If the question is "how do I build a team that actually works?" — the tool needs to do something different. It needs to describe not only who someone is, but what they do with other people. How they behave under pressure. What they contribute. What they leave uncovered. What happens when you put two of them together.

Personality tests were not built for that question. They profile one person at a time. The team picture has to be assembled separately, by inference. And inference, in team building, is how mismatches happen.

Why Behaviour Is the Right Language for Teams

Behaviour is practical in a way personality is not.

You cannot ask someone to stop being an introvert. You can ask them to share their analysis before the decision is made, not after. You cannot ask someone to stop being a high-tempo driver. You can ask them to hold the first idea for sixty seconds before moving to action.

Personality describes. Behaviour gives you something to work with.

Behaviour is also learnable and adaptable. People shift their behavioural contribution depending on what the team needs, who else is in the room, and what the situation demands. A good assessment captures that range — the peak contribution and the manageable contributions a person can stretch into when the team needs them.

And behaviour is observable. Your colleagues see it. They respond to it. They can give specific, concrete feedback about it — something they could never do about a personality trait, because they experience behaviour, not underlying psychology.

Why Belbin — Specifically

The Belbin Team Roles framework was developed at Henley Management College in the 1970s. Built from nine years of systematic team observation. The research question was simple and hard: what actually predicts whether a team will succeed? The answer was not individual intelligence. Not technical skill. Not even experience. It was the behavioural mix within the team — the specific contributions people brought and how those fit together.

Belbin was built for teams. Not adapted for them after the fact. Built for them from the start.

That origin shows in the structure. Where most personality frameworks produce four or five categories, Belbin identifies nine distinct team contributions. Four or five categories can capture broad preference differences. Nine categories can explain why two people who share the same preference profile produce completely different outcomes in a team — because the difference sits in the behavioural detail that four categories flatten.

The nine roles are not personality types. They describe what people actually do in teams. What they contribute. What they notice. What they initiate. What they protect. The distinction matters when you are trying to design a team rather than describe an individual.

For the full nine-role framework, read Belbin Team Roles: The Practitioner's Guide to What Teams Actually Need

The Part That Personality Assessment Cannot Reach

Most assessment tools stop at self-report. One person answers questions about themselves. The tool processes the answers and produces a profile. No external input. No other perspective.

Belbin does something the other tools do not. It adds observer assessments — structured feedback from four to six colleagues who work directly with the person. Their observations are collected separately and compared against the self-perception data. The comparison between those two sources is where the most useful information lives.

Research on more than 78,000 Belbin profiles across 30 countries found that only 17.7% of people show a coherent match between how they see themselves and how their colleagues experience them. The other 82.3% are operating on assumptions their teams do not share.

Those assumptions are where communication breakdowns sit. Where misunderstood meetings come from. Where the friction nobody can explain has been building for months.

For the full self-awareness argument, read Self-Awareness: You Think You Know Yourself. Your Team Sees Something Different.

The Bonus: Self-Reflection Comes With It

This is the part most people do not realise until they have been through the process.

If you complete a Belbin assessment with observer feedback, you do not just get a team tool. You get the most honest mirror available for self-reflection — because it shows you the gap between how you see yourself and how the people who work closest with you actually experience you. That gap is more useful than any personality profile, because it is not based on your own assumptions. It is based on observed behaviour.

So: any assessment for self-reflection is a reasonable starting point. But if you want a team tool that also gives you genuine self-reflection, Belbin with observer feedback does both — and does them on the same data set.

For the full comparison between behavioural and personality assessment, read Behavioural Assessment vs. Personality Tests: Which One Actually Helps Your Team?

$24 billion of investment by 2031 is the market answering a question most organisations have not asked out loud yet: how do we understand what people actually do with each other, not who they are alone? Open the assessment → and add observer feedback from the people who work with you. The gap between what you find and what you assumed is where team development — and self-development — begins.

Sources

The Insight Partners. Personality Assessment Solution Market Size and Forecast, 2025–2031.

Belbin UK. Behavioural vs Psychometric Tests (belbin.com)

Belbin UK. Research across 78,000+ profiles — self-awareness and observer gap data.

Eurich, T. Insight: The Power of Self-Awareness (2017)