Measure the athlete and the arena
The leader side should describe stable tendencies that affect work: openness to new information, conscientiousness, social energy, interpersonal accommodation, emotional reactivity, and narrower facets that sharpen those broad traits.
The role side needs equal discipline. Measure threat, stability, decision tempo, network scale, resource slack, feedback delay, and the consequences of error. A candidate can look decisive in a settled operation and reckless in a volatile one. The behavior is similar. The setting changes its value.
End with a testable decision
An assessment should distinguish evidence from inference and state what would change the conclusion. It should also produce an action that can be observed within a defined period.
That makes the output useful for selection, transition planning, and development. Without the role comparison, the report is a portrait. Promotion requires a forecast.