Cognitive Load Is a Budget, Not an Enemy: Design for the Brain’s 4 Chunks

Cognitive load is the mental effort users spend to perceive, understand, decide, and act within an interface, drawn from a working memory that holds roughly 4 chunks. The design task is allocation: spend that scarce budget on the user’s goal, cut everything else, and mind the new debts run up by open loops and Slow AI. 26 design guidelines show how.