Definition
Choice architecture is the practice of designing the context in which people make decisions — the order of options, the default setting, the framing, the number of choices, and the way information is displayed. The person or system that arranges these elements is the choice architect.
The central insight, developed in behavioral economics, is that there is no neutral way to present a choice. Every layout influences the outcome, so the only question is whether that influence is deliberate and helpful.
Why it matters
How it works
Choice architecture works with bounded rationality rather than against it. Because people rely on shortcuts and default to inaction, small structural changes have large effects: switching retirement savings from opt-in to opt-out dramatically raises participation without forbidding anyone from choosing otherwise.
A nudge is a change in the architecture that steers behavior predictably while preserving every option and imposing no significant cost. Good choice architecture makes the easy path the beneficial one. Because the same levers can mislead — so-called dark patterns — the discipline is bound up with questions of transparency and ethics.