Can leadership potential actually be measured?

The honest answer to the question is no — not with certainty, and not for any individual. Anyone claiming otherwise is selling something. But that answer is also close to useless, because the alternative is not certainty either. The alternative is a room of senior people forming impressions.

The useful question is comparative: does structured assessment predict future performance better than experienced judgement on its own? On that, the evidence is not ambiguous.

What the research settled decades ago

Structured, criteria-based assessment consistently outperforms unstructured interviewing in forecasting job performance. The finding has held across meta-analyses spanning decades and thousands of studies. It is not a new or contested result.

What makes the difference is not sophistication but structure: the same criteria, applied in the same way, to every candidate, by assessors calibrated against one another. Most of the predictive gain comes from removing variation in how the judgement is made, not from the cleverness of the instrument.

The gain comes from removing variation in how the judgement is made — not from the cleverness of the instrument.

Where boards go wrong with the answer

• Treating a score as a verdict. Assessment narrows uncertainty; it does not eliminate it. A board that outsources the decision to a number has misunderstood the tool.
• Assessing against the current role. Potential is only meaningful relative to a defined future demand. Without that definition there is nothing to measure against.
• Running the exercise once. Readiness moves. A reading taken three years ago describes a person who no longer exists.

Used properly, assessment does something more modest and more valuable than prediction: it makes the basis of a decision visible, comparable and open to challenge. That is what allows a board to defend an appointment — and, when necessary, to change its mind.