Why an exceptional result often doesn’t repeat
A result is rarely a pure readout of ability. In sports, tests, and other repeated performances, it reflects both a person’s underlying skill and temporary influences: a favorable bounce, a good night’s sleep, a distraction-free setting, or plain chance. When those influences happen to line up, the score can land far above the person’s usual range.
How scores drift back toward the usual level
The next performance still contains the person’s skill, but the temporary boosts are unlikely to recur in precisely the same combination. The score therefore tends to move closer to the person’s average. Statisticians call this regression to the mean: unusually high or low results are often followed by less extreme ones, even when the underlying ability has not changed.
The same logic applies after a poor result. A bad day may include unusual setbacks, so the next score can improve simply because those setbacks do not repeat. That improvement is not, by itself, evidence of a sudden leap in skill—just as a return toward average after a remarkable performance does not prove a decline.
Why this matters when judging performance
The pattern is easiest to see when someone is selected for attention because of an extreme result. A coach who praises an athlete after an unusually strong game may see a less spectacular game next; a teacher who intervenes after a student’s unusually low test may see a higher score afterward. Neither sequence alone shows that praise hurt performance or that the intervention worked. To assess a real change, it helps to look at repeated results and other evidence, rather than treating one exceptional score as the new normal.
