Surveyed groups of professionals asked to rate their own job performance or skill relative to their peers consistently produce a distribution where a clear majority rate themselves as above the group's average — a mathematically impossible outcome at the population level, since by strict definition only half of any group can genuinely be above that same group's actual average on a given trait. This well-documented pattern, called illusory superiority or the above-average effect, applies directly to how consultants and other professional advisors tend to assess the quality of their own advice and judgment relative to peers.
Why this specific pattern is mathematically impossible, not merely improbable
If a genuine majority of a group rates itself above that same group's actual average on a specific trait, this isn't simply an unlikely but possible outcome — it's a direct mathematical impossibility, since the average is, by definition, the point that exactly divides a group into those above and those below it, meaning the widely replicated finding that clear majorities rate themselves above average reveals a genuine, systematic bias in self-assessment, not an accurate reflection of how skill is actually distributed within the surveyed group.
What the underlying research has found across various professional contexts
Studies asking professionals across various fields to rate their own job performance, ethical judgment, or specific professional skills relative to their peers consistently find this same above-average pattern, a result replicated broadly enough to be considered one of the more reliable findings in the broader research on self-assessment accuracy, extending naturally to professional advisors' assessment of their own advice quality and judgment.
Why this specifically matters for consultants assessing their own advice quality
A consultant's own confident sense that their strategic judgment and advice quality rank above the typical standard among peers in their field is, given this well-documented research pattern, more likely to reflect a common, near-universal self-assessment bias than a genuinely accurate, dispassionate ranking — meaning individual confidence in one's own advice quality, however sincerely held, is weak evidence on its own of where that quality actually ranks relative to genuine peers.
Why this bias is genuinely difficult to correct through simple awareness alone
Knowing about illusory superiority in the abstract doesn't reliably exempt any individual professional from experiencing the same bias regarding their own specific case — research on this effect has found that even people made aware of the general finding continue to rate their own individual performance above average, suggesting the bias operates at a level that simple intellectual awareness alone doesn't fully correct.
What actually helps counter this bias in professional self-assessment
Seeking genuinely external, independently sourced feedback on advice quality and judgment — direct client feedback, peer review from colleagues genuinely positioned to evaluate the work critically, outcome tracking against original recommendations — provides an external check this internal, self-generated bias doesn't reliably self-correct for on its own. Treating a strong internal sense of above-average competence as a starting hypothesis requiring genuine external verification, rather than as settled, accurate self-knowledge, is a more honest and more productive stance given how consistently this bias has been documented.
What this means for consultants and professional advisors evaluating their own work
- Recognize illusory superiority as a well-documented, near-universal bias, not evidence that your own specific self-assessment is the accurate exception
- Seek genuinely external, independently sourced feedback on advice quality rather than relying on internal confidence alone
- Track actual outcomes against original recommendations over time as a more objective check than self-assessed confidence
- Treat a strong internal sense of above-average professional competence as a hypothesis requiring external verification, not as settled fact
Illusory superiority's mathematical impossibility at the population level is precisely what makes it such a clear, unambiguous demonstration of a genuine bias — and the uncomfortable implication for any individual professional reading about it is that the same bias very likely applies to their own self-assessment too, not just to everyone else's.