A business coach said something to me recently that stopped me mid-sentence: "We don't have a good way to assess potential. Only performance."
He's right. And it is quietly costing businesses their next generation of leaders.
Here's how it usually plays out. Someone delivers brilliantly in their current role. They hit their numbers, they're reliable, nobody has to chase them. So they get promoted. Twelve months later, they're either thriving in a job that looks nothing like the one they were good at. Or they're stuck, still operating like an individual contributor with a bigger title, and the business is quietly wondering what went wrong.
What went wrong is that the promotion was based on performance. Nobody assessed potential, because most businesses don't have a way to.
After years of coaching senior leaders through exactly this transition -the ones who stepped up, and the ones who stalled - I've found potential comes down to three things: emotional maturity, how tied someone is to their current identity, and their capacity to make (and hand over) decisions.
Performance tells you what someone has already done. These three markers tell you whether they can do something they've never done before.
Performance tells you whether someone succeeded in the role they currently hold, under conditions you can already see. Potential tells you whether they can succeed in a role they've never held, under conditions that don't exist yet. More scope, more ambiguity, less oversight, and often, former peers now reporting to them.
A good quarter is not the same as leadership potential. That is a performance signal being asked to do a job it was never built for.
This is why so many promotions look right on paper and fall apart in practice. The Leadership Pipeline model, developed by Ram Charan, Stephen Drotter and James Noel, makes the point directly: the shift into a bigger leadership role is "more focused on values than skills." The skills (the doing) are the easy part to change. What's hard is the identity shift underneath it (the leadership being), and that's exactly what performance data can't see.
Everything in this article is also true of managers. A manager with low emotional maturity, a wedded identity and inconsistent decision-making will slow their team down and frustrate the people around them. That's a real cost. It's usually recoverable, through coaching, a change of role, or simply time.
At executive level, the same three gaps don't stay contained to one team. An executive's decisions touch the P&L, the board, and every function beneath them. A defensive, identity-stuck, indecisive manager creates friction. The same person as an executive creates strategic drift, a leadership team that stops being honest with them, and a business that stalls at exactly the level it's most expensive to fix.
Leadership IQ's research has found that around 46% of newly appointed executives fail within 18 months. Not from a lack of technical skill, but from the kind of cultural and behavioural misalignment these three markers are built to catch. And the widely cited cost of getting an executive appointment wrong - once severance, lost productivity and strategic derailment are counted - runs into multiples of that person's salary, not fractions of it.
A manager who is defensive costs you a team. An executive who is defensive costs you the business.
This is why these three markers deserve more rigour, not less, the higher the role goes.
Emotional maturity is not about how many years someone has worked. It's about their self-esteem and their self-confidence. Most tellingly, it's what happens to their behaviour when the ground shifts under them.
This shows up most clearly when someone is promoted to lead people who used to be their peers. Needing to have all the answers is not confidence. That is insecurity wearing a title.
Less mature leaders feel they have to justify the promotion, so they avoid saying "I don't know," they over-explain, and they hover over work that isn't theirs to do anymore. Emotionally mature leaders do the opposite. They're comfortable admitting when someone else in the room knows more. They ask questions instead of performing certainty. And because they don't feel threatened by their former peers, they actually delegate - communicating clearly and letting information move without needing to control it.
Studies consistently find that employees value leaders who demonstrate intellectual humility. When managers are open about what they don’t know and clear about their limits, people tend to see them as both more trustworthy and more capable.
There's a also mindset marker sitting alongside all of this: how someone interprets other people's behaviour when they don't have the full picture. Defensive leaders default to the worst version of events. A slow reply reads as disrespect, a question in a meeting reads as a challenge, being left off an email reads as a slight. Emotionally mature leaders default to a more generous read and ask what they're missing before deciding what something meant. That isn't naivety. It's the same self-confidence and emotional control showing up in a different situation, a leader who doesn't feel threatened doesn't need to go looking for threats.
A leader who assumes the worst about people is not being realistic. That is defensiveness dressed up as instinct. It's often the first sign of a leader heading toward burnout, not just a difficult personality.
This isn't just about avoiding worst-case thinking. The leaders who handle pressure well tend to run on genuine optimism by default, not blind positivity. A real belief that problems are solvable and people are trying their best until proven otherwise. Positive leadership styles measurably lift team performance; negative, distrustful ones measurably suppress it. That one disposition shapes almost everything else on this list.
What to watch for: Can they say "I don't know" in front of their team without flinching? Do they delegate the interesting work, or just the tasks they don't want? Do they give people the benefit of the doubt, or do they go looking for evidence to confirm the worst interpretation? Do they still need to win the argument with people who used to be their equals?
This is the marker that's hardest to see and does the most damage when missed.
Leadership identity is the internal story someone holds about who they are as a leader - "I'm the expert," "I'm the one who gets things done," "I'm the caring leader." It's built over years, largely from sources most leaders never examine consciously: past managers who left a mark and hardened into unconscious rules ("I will never make my team feel invisible the way she made me feel"), family and social conditioning about achievement, conflict and authority, and whatever strengths got rewarded and reinforced along the way.
None of that is wrong. It was probably exactly right, once. The trap is that strengths are contextual. What makes someone exceptional in one role can be the very thing that holds them back in the next.
This is where potential quietly stalls. The "expert" who can't delegate because their identity is tied to having the answers. The "doer" who keeps doing instead of leading through others, because stepping back feels like slacking. The "caring" leader who avoids a hard conversation because in their own story, caring leaders don't cause discomfort. In every case, the issue isn't capability. It's attachment - to a version of themselves that no longer fits the role they're being asked to grow into. Someone who still needs to be the smartest person in the room is not ready to lead the room. That is expertise mistaken for leadership.
Dr Susanne Cook-Greuter's research on adult ego development describes this precisely: leaders don't just add skills as they move up, they move through genuine stages of psychological maturity -from an identity built on being the expert, toward one built on the collective outcome.
Growth here rarely happens in a straight line, and it rarely feels like growth while it's happening. One of my executive coaching clients - a senior leader whose team, when we started working together, had only 20% rating her as a promoter - described the process like this: "I had to suffer so many ego deaths throughout this process to be the person they needed, who in reality wasn't the version I thought I wanted to be." Not one ego death. Many.
By the time we finished working together, 92% of her team were promoters - not because she became someone else, but because she loosened her grip on an identity that had worked for her once, in a different context, and grew into what this team actually needed.
What to watch for: Ask them to describe their team's last big win, and listen to the pronouns. Notice whether they treat feedback that contradicts their self-image as useful information or as an attack. And pay attention to how they build self-awareness - as an ongoing discipline, or only when it's forced on them.
It feels intuitive that great leaders make great decisions, constantly and correctly. The reality at senior levels is closer to the opposite. Enterprise leaders are typically judged on three or four genuinely high-leverage decisions a year. Their real job is figuring out which decisions those are - and building a system that lets everyone else make the rest without escalating to them.
Making every call is not decisiveness. That is control dressed up as leadership.
The leaders who stall here usually do one of two things. Either they hoard decisions - becoming the bottleneck their whole team routes through - or they hesitate on the decisions that are actually theirs to make, adding another approval layer, seeking one more round of validation or revisiting a call they've already made. Both look like diligence. Both are actually a leader who hasn't yet built the confidence, or the framework, to push decision rights outward.
There's a real cost to getting this wrong that goes beyond one bad promotion. DDI's Global Leadership Forecast has found that high-potential talent is significantly more likely to leave within a year when their manager doesn't regularly hand them real growth and decision-making opportunities. If you've never actually let a candidate own a decision with real stakes, you haven't tested this marker - you've only guessed at it.
What to watch for: Hand them one real decision, with real stakes, and step back. Do they make the call and own it, or do they come back for reassurance three times before committing? Can they tell you, unprompted, which two or three decisions in their current role actually matter - and which they've already handed to someone else?
No. And this is the exception that matters most, especially with younger or first-time leaders. Someone can be emotionally immature, still tightly wedded to their old identity, and inconsistent at making decisions, and still have real potential. Being underdeveloped is not the same as being unready. That's a timeline problem, not a character problem.
What actually predicts whether they’ll close that gap isn’t where they’re starting from. It’s whether they’re genuinely committed to growing and changing, and whether you can see evidence of that commitment when you challenge them, not just hear them agree with you in the room.
The combination that should worry you is different: an ego so fused with their current identity that any challenge to it feels like an attack, paired with the distrustful, worst-case read of people covered under emotional maturity. That pairing is what actually predicts someone won't change — not inexperience. A leader who's defensive about who they are and suspicious of everyone around them has nowhere for feedback to land.
What to watch for: When you challenge their view of themselves, do they get curious or do they get defensive? Do they show you something different six months after a piece of feedback, or just agreement in the moment? Do they trust that the people giving them hard feedback (including you) actually want them to succeed?
You don't need a personality test to assess this. You need to watch someone in a live situation and pay attention to specific behaviour, not a gut feeling.
None of these tests take more than a single conversation or a single project cycle. What they give you is something a performance review never will: evidence of how someone behaves when the conditions change, not just when they don't.
Potential is invisible for a while. Like a magnolia in the depths of winter, the growth that matters is happening underground, before there's anything to see above the surface.
Performance is the flower - visible, easy to measure, easy to reward. It can be beautiful to behold. Potential is the root system underneath it. If you only ever assess the flower, you'll keep promoting people who look ready and aren't, and overlooking people who are ready and don't look it yet.
If you're weighing up a promotion decision right now and you're genuinely unsure whether you're looking at potential or just performance, that uncertainty is worth taking seriously - a wrong call here is expensive to unwind, for the business and for the person you've promoted.
In my executive coaching practice, I work with CEOs and senior leaders to work through exactly this question properly, before the decision is made, not after it's gone wrong. If you'd like a second, experienced set of eyes on a promotion decision you're sitting with, book a conversation with me.