The wrong leadership assessment can do real damage.

After many years delivering hundreds of leadership assessments across all kinds of leaders, teams and sectors, there's one thing I'm clear on: the right tool at the right time is critical.

There is no single diagnostic that works for every situation, and the options can be overwhelming. I consider myself 'tool agnostic' for this reason.

Assessments can be incredible for building awareness, one of the cornerstones of adaptability. You can't grow and adapt if you don't know your baseline.

I'm a strong advocate for assessments in the right contexts, and have witnessed incredible, transformational growth for many leaders as a result of undertaking them.

But they can also be damaging if not selected and debriefed carefully. I've heard of people hurt, confused, shocked and worse.

What really irks me is when tools are 'sold in' purely because a practitioner is accredited in them, rather than what is the best fit.

What worries me is when a sensitive and delicate people process being outsourced to those with little or no experience, an insensitive debrief approach, or the lack of robust assessment, process or accreditation.

This can have severe repercussions.

From your leaders spending copious amounts of time filling out questionnaires with no impact, to others completely baffled by complex, irrelevant findings with no clarity on how to apply them. From toxic leaders permitted to carry on despite the evidence, to a group of your best leaders spinning or scared about their results.

Suffice to say, severe blows to confidence, insecurities about how they'll be used, or just wasted time under pressure do not fuel performance.

At best, the wrong intervention is simply not a great return on your investment.

The right assessment depends entirely on the context, the team's maturity, and what you're actually trying to reveal. And the delivery matters just as much as the tool itself.

Here are the ones I reach for most often, and where I've found each of them are best applied:

1. Personality: Essential for senior leaders. Builds self-awareness by revealing innate strengths, motivators and derailers under pressure. Valuable for leadership, recruitment, succession planning, and career conversations.

2. 360-Degree Feedback: Great for development. Brings in perspectives from multiple directions, peers, direct reports, stakeholders. Not the right starting point for new teams or leaders who haven't yet built credibility and trust.

There are an enormous range of options for 360s, from the more practical, to the very technical and psychological. Select for the leadership maturity and needs of the group.

3. Behavioural and Social Styles: Great for awareness and team connection/communication. Clarifies how people prefer to communicate and work, and a lighter option that's often underestimated. When people understand their own style and the styles around them, relationships and team dynamics shift quickly.

I've heard complaints that they build awareness and not action, but in my experience that relies entirely on the quality of the tool and the debrief to support you with how to adapt your style and when. Just don't mistake them for a psychological profile.

4. Strengths: Helps people see and lean into what people do best and what is unique to them. Sounds simple, but it's remarkable how many capable people are operating well below their potential because what they're naturally good at has never been articulated.

5. High-Performing Teams: One of the most powerful tools available for a team that's ready to do serious work on itself. Identifies performance gaps and levers, with benchmarked data to back it up. Requires at least five people and works best when the team has some history together.

6. Leadership Capability: Measures strengths and potential across key leadership attributes, including influence, adaptability, inclusion, and delivery, against proven benchmarks. Useful for identifying who's ready to step up and where targeted development will have the most impact.

7. Mental Toughness is broader than it sounds. Looks at resilience, grit, wellbeing, and performance capacity with a well evidenced, clear and practical framework. Increasingly relevant for senior leaders who are carrying a lot. Works well both individually and in a group setting.

This list certainly doesn't cover everything, and none of these options are silver bullets. What they offer is a clearer, more objective view of what exists, which paves the way for growth and change.

Used alongside your own qualitative insights and instincts, they can fast-track understanding that would otherwise take a very long time to develop.

The key is to get very clear on what you need, then select the right tool and practitioner for your people and purpose.

One of my clients is doing a pilot of two approaches to make sure they're getting it right - an excellent idea.