Decision fatigue is the deterioration in decision quality that results from making a large number of decisions. As the number of choices accumulates, the brain becomes less effective at evaluating options, more likely to default to the status quo, and more prone to impulsive or random choices.
Research on decision fatigue emerged from studies of judges, parole boards, and medical professionals, all contexts where decision quality was measurable and the volume of decisions was high. The consistent finding: later decisions in a sequence are worse than earlier ones.
The problem is not intelligence or character. It is the depletion of cognitive resources that every decision requires. The solution is structural: reduce the number of decisions that need to be made actively.
Strategies that reduce decision fatigue include batching similar decisions together, establishing defaults and systems that remove recurring choices, making important decisions earlier in the day, and simplifying domains of life where decision quality matters less.
Decision fatigue is a structural problem. It responds to structural solutions, not more effort.