EV-0043
The 360's own premise, honestly reported
Atwater, L. E., & Yammarino, F. J. (and the self-other agreement literature following them) (1997). Leadership Quarterly / Personnel Psychology - review literature, 1992 onward · Source
What this entitles us to say
A body of work categorising leaders by the gap between their self-ratings and others' ratings - over-estimators, under-estimators, and those in agreement - and generally finding over-estimators rated least effective, though the finding is sensitive to how the categories are drawn.
What it found
Leaders are grouped by the relationship between their self-ratings and their subordinates' ratings: over-estimators, under-estimators, in-agreement/good and in-agreement/poor. Using the four-group model, superiors rated in-agreement/good raters and under-estimators as more effective than over-estimators. Using a six-group model, that advantage weakened - in-agreement/good raters were not seen as more effective than over-estimator/good raters.
The general conclusion drawn from the literature is that leaders whose self-perception aligns with others' perceptions tend to lead more effectively, with discrepancy in either direction associated with worse outcomes.
Why it matters here
This is the research under our own centerpiece, and it is the entry where the fourth principle is hardest to keep. The self-versus-others gap is the most powerful and most shareable thing the CDL assessment produces. It would be very easy to cite this literature as settled. It is not.
What honestly survives:
- The gap is informative - it carries information neither rating carries alone. - Over-estimation is the direction that looks worse, consistently enough to build on. - The effect is sensitive to method, and should be described as a pattern rather than a law.
What this means for the product is not that the 360 is weakened but that its claim should be modest and exact. The 360 is worth building because the gap tells a leader something they cannot otherwise see - not because research proves that closing the gap makes people more effective. It does not prove that.
This is also the trait's own subject applied to us. Truth-seeking means going and getting the data that might contradict you. A program selling that has to do it about its own instrument first.
The limits
This is a review literature rather than a single definitive study, and the finding depends materially on the categorization used - a four-group model shows over-estimators as less effective, while a six-group model weakens that. Effectiveness is usually rated by superiors, so it is one perception compared against others. Correlational throughout, and it cannot say that closing the gap improves anything. Verified to abstract level; the specific citation should be firmed up before this appears in sales material.
What we do not say
"Research proves 360 feedback makes leaders more effective," or that closing the gap causes improvement. Neither claim is supported here.