When UK organisations invest in leadership development, they often wonder, ‘Which leadership assessment tools should we use?’ The market is full of personality tests, 360s, behavioural diagnostics, team assessments and leadership profiles - all promising clarity, insight and better performance.

But in our experience, the real value isn’t in the tool itself.

It’s in how the tools come together to help leaders grow.

At Firefly, we believe leadership assessments should act as mirrors, not labels. The goal isn’t to categorise leaders or highlight what’s wrong - it’s to illuminate what’s possible. The right diagnostic helps leaders see themselves more clearly, understand their impact, and make intentional choices that support real change.

In this article, we explore the leadership assessment tools organisations actually use (including the ones we personally recommend) - and how to choose the ones that deliver real insight.

Why leadership assessments matter - and why many miss the mark

When used well, leadership diagnostics can:

• Reveal behaviour problems and blind spots

• Strengthen self-awareness

• Accelerate communication and collaboration

• Improve team performance

• Build a shared language across an organisation

• Support long-term leadership culture change

But many assessments fall short because they label rather than liberate. They oversimplify behaviour, create static identities, or leave leaders with a report they don’t know how to use.

The most effective assessments inspire curiosity, reflection and action. They help leaders explore how they think, how they behave, and what shifts might create better outcomes.

Leadership Assessment Tools Organisations Commonly Use

These are ones that we personally use with our clients:

1. Everything DiSC®

Everything DiSC is one of the most popular and accessible behavioural assessments for UK organisations. It helps leaders understand their communication preferences, stress triggers and behavioural tendencies.

Why it works

• Offers practical, memorable insight

• Helps teams improve day-to-day communication

• Enables leaders to adapt behaviour under pressure

• Reduces misunderstandings and friction

• Creates shared language across departments
  

Firefly POV

We use Everything DiSC because it helps leaders understand their behavioural impact without boxing them into a fixed identity. One feature we find especially powerful is the ability to generate comparison reports with peers. This helps colleagues see where their styles align, where they differ and how they can support each other better. It opens the door to stronger relationships, clearer communication and more grounded team collaboration.

2. The Leadership Circle Profile

The Leadership Circle Profile (LCP) is one of the most comprehensive, research-backed 360 assessments available. It links leadership behaviour to underlying assumptions and beliefs - giving leaders insight into why they lead the way they do.

Why it works

• Integrates adult development theory

• Highlights both creative competencies and reactive tendencies

• Connects inner mindset to outward impact

• Encourages deep reflection and sustained change

Firefly POV

We value LCP because it moves leaders beyond surface-level behaviour into exploring the patterns that shape how they show up. It shifts the conversation from ‘What’s wrong?’ to ‘What’s possible if I lead differently?’ It also helps leaders to understand the reasons for their behavioural patterns and from there, they can act with greater choice and intention.

3. Five Behaviours of a Cohesive Team

Five Behaviours of a Cohesive Team is a team assessment that explores the five foundational behaviours that determine whether teams thrive:

1. Trust

2. Conflict

3. Commitment

4. Accountability

5. Results
   

Why it works 

It looks at the team as a system, not a collection of individuals. Leaders learn how their interactions influence team performance and where new habits or agreements could unlock better results.

Firefly POV

Five Behaviours is a powerful mirror for collective dynamics. We use it when organisations want to strengthen trust, communication and accountability across a team. It’s actionable, accessible and grounded in real team behaviour.

Other leadership assessment tools used in organisations

While these aren’t primary tools in Firefly programmes, they are widely used across UK organisations and can offer valuable insight depending on the context and the outcomes an organisation is looking to achieve:

Myers-Briggs Type Indicator (MBTI)
MBTI is one of the most recognisable assessments globally. It explores personality preferences across four dimensions and assigns one of 16 “types.” Many teams use it to build early self-awareness, open conversations about individual differences and create a shared language for collaboration.

Discovery Insights
Discovery Insights uses a colour-based model to help leaders understand their preferences, communication style and working relationships. It’s popular in organisations because it is memorable, easy to apply, and offers teams a way to talk about differences constructively. Many organisations use it to strengthen collaboration and enhance team understanding.

CliftonStrengths (StrengthsFinder)
CliftonStrengths identifies a leader’s top strengths from a list of 34 talent themes. It supports confidence-building, helps leaders understand what they naturally do well and encourages strengths-based development across teams.

Emotional Intelligence (EQ/EI) assessments
Emotional intelligence assessments explore a leader’s ability to recognise, understand and manage emotions - both their own and others’. These tools are especially useful in roles requiring strong relationship skills, influence, collaboration and conflict resolution.

The key is choosing tools that encourage growth - not rigid labelling, stereotypes or fixed identities. Tools should illuminate possibilities, deepen reflection and support real behavioural change.

An integrated approach to leadership assessment

At Firefly, we don’t use assessments as isolated tools. We see them as interconnected mirrors that offer different but complementary insights.

• Everything DiSC gives teams a clear, practical language for behaviours and communication.

• Leadership Circle Profile reveals the internal mindset patterns driving external behaviour.

• Five Behaviours of a Cohesive Team shows how individual and collective behaviours shape team performance.

Individually, each tool is powerful. Together, they create a holistic, multi-layered picture of how a leader thinks, behaves and impacts others - and crucially, what is possible next. When we work with clients we’re often weaving together tools they use already and those which will help to create a more integrated approach.

Additionally, when the same profiles are used across an organisation, the insight becomes systemic. Shared language strengthens relationships at every level, and a skilled partner can identify broader organisational patterns - offering leaders a clearer picture of cultural dynamics, strengths and areas for collective growth.

How to choose leadership assessment tools that deliver real insight

If you’re exploring options for your organisation, consider these factors:

1. Prioritise tools that build conversation, not categories
   If leaders walk away with a ‘type’, the tool has limited value.
   

2. Choose diagnostics that link inner drivers to outward behaviour
   Insights matter when they illuminate why a pattern exists
   

3. Ensure assessments align with your organisational goals
   Do you want better communication? More cohesive teams? More courageous leadership? Choose accordingly.
   

4. Look for tools supported by coaching or facilitation
   A power assessment tool without debriefing is just data. At Firefly, coaching (individual, group or team) is integrated into every programme.
   

5. Avoid tools that simplify or stereotype your leaders
   If the assessment reduces complexity, it won’t support real development.
   

Diagnostics should illuminate possibility

Insights only matter when they lead somewhere. Our approach is designed to help leaders:

• Understand themselves more clearly

• See the impact they have on others

• Experiment with new behaviours

• Strengthen communication and trust

• Build momentum across teams
  

We use assessments not to define leaders, but to help them grow.

Ready to explore leadership assessment options for your organisation?

If you want help choosing the right diagnostic tools for your leadership (or you’d like to explore Firefly’s integrated approach), we’d love to start a conversation. Click here to get started.