The leadership style that works for half your team, and backfires for the other half.

Assertive, decisive, take-charge leadership gets described as good leadership, almost as a default. The research says it depends entirely on who's being led.

The finding

A field study of 57 stores, using actual profit data rather than survey opinions, found that extraverted, assertive leadership was associated with better outcomes for passive employees and worse outcomes for proactive ones. A lab replication found the same pattern. Put simply: an assertive manager gets the best out of someone who prefers to be directed, and gets a worse result out of someone who prefers to drive things themselves. Same manager, same style, opposite effect, depending entirely on who's on the other side of it.

The part that gets missed

Here's where it gets more specific, and more useful than "opposites attract" as a general rule. A separate study looked at what was carrying the outcome, liking and task performance, and found the effect wasn't really about dominance at all, but rather warmth. Managers and employees who were similarly warm, or similarly reserved, got along and performed well together. Matching on assertiveness specifically didn't predict much once warmth was accounted for.

So the accurate version is narrower than either "opposites work better" or "likes attract." Being alike helps on warmth. Being different helps on dominance, but mainly for how comfortable the pairing feels, not necessarily for the work itself. Two different mechanisms, doing two different jobs.

What this means for a proactive employee under an assertive manager

Neither person is the problem here. What's happening is a mismatch on one specific axis, dominance, and that mismatch tends to get misread as something else entirely: a performance issue, a personality clash, a sign the hire was wrong. None of those readings hold up once you know which axis is doing the work.

This is also the reason we treat dominance as the one place complementarity matters in how we think about fit. Every other interpersonal trait in the model is scored as similarity. Dominance is the exception, and it's the exception because the evidence specifically supports it there, not everywhere.

The takeaway

A leadership style fits some people better than others, and the axis that decides which is dominance, not warmth, not conscientiousness, not any of the traits a leadership seminar usually reaches for. Knowing which axis is at work won't fix the pairing by itself, but it does replace "one of you is difficult" with something a manager can work with.