Is Your Leadership Assessment Telling You the Right Thing?

If you’ve supported leaders through any kind of development initiative, you’ve learned that the world of leadership assessments is vast, and crowded. DiSC. StrengthsFinder. MBTI. Hogan. EQ-i 2.0. The Leadership Circle. Maybe a 360. These are all good tools. So which one do you use? How do you decide?

Most people start with quality: Is this a good assessment? Reliable? Valid? But a better and more useful first question to ask is: What do I want to measure? Are you assessing role fit? Potential? Values? Behaviors? Leadership style?

Each tool measures different things, and solves a different problem.

Measure what matters

The leadership assessment landscape falls into four broad categories, and keeping them distinct is the key to making a good choice.

Some tools — personality assessments like the Big Five, Hogan, or MBTI — are designed to answer the question: Who am I? What drives me? These are valuable for self-awareness, team communication, and understanding the psychological tendencies a leader brings to every situation.

Others measure behavioral style: how a person describes the way they show up at work. Tools like CliftonStrengths, LSI, and DiSC fall here. These are self-report tools that surface preferences and patterns, particularly useful in the early stages of a development journey.

Still others assess capability: emotional intelligence, cognitive range, derailer risk under pressure. These measure what a leader has developed over time and where the edges of that development are.

These three categories share something important: they are, fundamentally, tools that illuminate the inner world of the leader. They tell you something important about how a leader sees themselves: their traits, their preferences, their style, their self-perception. If that’s what you want to measure, those tools will do the trick.

But there is a fourth category, methodologically distinct from everything above: observer-rated, multi-perspective assessments, 360 assessments. Rather than asking leaders to reflect on themselves, these tools ask the people around them to report on what they actually experience. The question shifts from who am I? to what am I producing in the people around me? That’s a different unit of analysis entirely,  and one many organizations underinvest in.

The gap self-awareness misses

The hardest leadership problems aren’t usually about self-awareness. Leaders often know, at some level, that they can be too controlling, or too hesitant. They’ve gotten feedback that they delegate too little, or talk too much. They know they struggle to influence peers, or fail to give useful feedback to their teams.

What’s missing isn’t more self-knowledge. It’s specific, observable data about how their behavior lands on others, what it does to them, and how it shapes their performance. That’s not something a self-report tool can provide, no matter how well designed. You can’t see your impact by looking inward.

This is the category of tools that many organizations underinvest in: observer-rated assessments that measure what a leader’s behavior produces in the system. Not how they intend to behave. Not how they think they behave. But how it actually lands on the people working with them.

Not all 360s ask the same question

360-degree assessments are methodologically distinct from everything in the first three categories. Rather than asking leaders to reflect on themselves, they ask the people around the leader — direct reports, peers, managers — to report on what they actually experience. That shift in data source is significant: you are no longer measuring how a leader sees themselves, but how their behavior lands on others.

Most 360s are built around a broad range of leadership competencies: communication, vision, strategic thinking, execution, developing others. That breadth is genuinely useful, particularly for identifying gaps across a leadership population or establishing a common development framework. But breadth has a tradeoff: it can diffuse the signal. A leader can score moderately across twenty competencies and walk away without understanding what is actually creating friction in their system.

This is why construct-specific 360s have gained traction — tools built around a more focused theoretical lens rather than a compiled list of best-practice behaviors. The Leadership Circle is the best-known example. It’s often mentioned alongside the DPI because it narrows the lens and touches on behaviors, reactive patterns, relational dynamics, how leaders show up under pressure that can appear to overlap with what the DPI measures.

But the Leadership Circle’s underlying construct is developmental maturity. It measures where a leader sits on a continuum from reactive to creative leadership, rooted in adult development theory. The feedback it generates is fundamentally about the leader’s interior operating system — how evolved their leadership consciousness is, how much their behavior is driven by ego-protection versus purpose. That is a sophisticated and valuable lens. But it is still, at its core, an inward one.

The Diamond Power Index® turns the lens outward. Its construct is not how developed the leader is, but how their use of power and authority is experienced by the people around them. A leader can score at a high developmental level on the Leadership Circle — genuinely purpose-driven, values-led — and still be creating dynamics of dependency, exclusion, or disempowerment that the DPI would surface. Development and impact are not the same thing. The DPI measures the latter.

Where the Diamond Power Index® fits — and why it’s different

The Diamond Power Index® (DPI) is a 360-degree leadership diagnostic built around a single construct: power use in leadership, specifically, how a leader’s use of power and authority is experienced by the people around them.

That distinction matters, because power is not one leadership variable among many. It is the variable that shapes everything else. Who gets heard in meetings. Who gets access to development. Who gets held accountable and who doesn’t. Whose influence matters, and how it’s used.

Using seven empirically-validated dimensions, the DPI captures both how a leader experiences their own authority and agency internally, and how that use of authority lands on the people around them. The gap between those two pictures, self-perception and observer experience, is where the most important development conversations begin.

What this means in practice

Culture is a downstream effect of how leaders use power, day after day. If you’re trying to understand why your culture isn’t where you want it to be — why engagement is stuck, why certain teams underperform, why senior leadership dynamics feel politically charged — personality and style assessments will tell you a great deal about the individuals in the system. But they won’t penetrate the layer of employee experience. To shift culture, you need data on that: real, multi-rater, behaviorally-specific data on what leaders are actually producing in the people around them. That’s what the DPI provides.

It doesn’t replace the tools your organization already uses. It completes the picture. Comprehensive leadership development sequences move from self-understanding and self-management, through leadership style and behavior, and eventually to the question of impact,  how development has actually translated into changed behavior as experienced by others. The DPI is the rigorous, specific test of that final question.

A different kind of conversation

Most leaders, when they receive DPI data for the first time, describe it as clarifying in a way that other assessments haven’t been. Not because the feedback is harder, but because it surfaces dynamics that have been felt in the system — by their teams, their peers, their organizations — but never quite named.

That’s what the Diamond Power Index® makes possible: the tools to see power clearly, name it directly, and develop the skills to use it well.

Explore the Diamond Power Index® →