This is a Lexicon entry: the mechanism, when it shows up, and the countermeasure. The full correction, with real-world cases and the audit prompt, hasn't been written yet.
Definition
The decline in the quality of decisions made by an individual after a long session of decision-making. Judges grant parole more often after eating; doctors prescribe more opioids when tired.
When it shows up
End of a long day of decisions. Late in a negotiation or performance review. After sequential choices with no break. Grocery shopping at 7pm versus 10am. Modern context: A content moderation team makes more conservative, error-prone decisions in the final two hours of their shift than in the first two. The error rate is not explained by case difficulty - it tracks time elapsed since the last break. High-stakes instance: Judicial decision-making - documented studies show that parole board approval rates are highest at the start of the day and after breaks and decline systematically through each session, with default denial becoming the fatigue response. Failure mode: Sequential choices deplete the capacity for deliberate evaluation. Later decisions default to the easier option, the status quo or the recommendation that requires no reasoning. Quality drops even on important choices if they come late in the sequence. Estimated cost: High - often irreversible where this bias dominates unchecked decisions.
Failure mode
Sequential choices deplete the capacity for deliberate evaluation. Later decisions default to the easier option, the status quo or the recommendation that requires no reasoning. Quality drops even on important choices if they come late in the sequence.
Countermeasure
Front-load important decisions to morning. Reduce routine choices via defaults (same breakfast, same commute, same weekly meals). Do not make consequential decisions when decision-depleted. When correction costs more than the bias: When the fatigue is signalling genuine information: I have already made many consequential decisions today and I should defer this one rather than deciding under reduced capacity. Decision fatigue is a problem when it produces poor decisions; it is a signal when it produces deferral.
Related traps
Also connected in the map8 more, locked
Credit & first seen
DiscoveredBaumeister, R.F. et al. (1998).Ego depletion: Is the active self a limited resource?Journal of Personality and Social Psychology 74(5), 1252-1265 source ↗
Also revealed
Entry #60 of 631 in The Lexicon · see the full Lexicon