Decision Fatigue

The deteriorating quality of decisions made after a long session of decision-making. The mental energy required for decisions is finite—each decision depletes the resource, making subsequent decisions worse. Judges grant parole at higher rates in the morning than afternoon. Consumers make poorer choices after extensive shopping. Decision fatigue explains why willpower fails at the end of the day and why simplifying routine decisions preserves capacity for important ones.

When to use it

When scheduling important decisions. When designing processes that require multiple sequential decisions. When willpower is failing at the end of the day. When decision quality seems to degrade over time.

How it can help

Explains why leaders make worse decisions as the day progresses and why simplifying low-stakes decisions (Steve Jobs wearing the same outfit) preserves quality for high-stakes ones. Essential for meeting design, decision scheduling, and personal productivity.