Textbook of Usability

Choice architecture is the deliberate design of the environment in which people make decisions. The term was popularised by Richard Thaler and Cass Sunstein in Nudge (2008), which argued that because choices are always presented in some context, there is no neutral presentation — and therefore designers are inescapably "choice architects" whether they intend to be or not.

Choice architecture includes:

• Defaults: what happens if the user does nothing
• Framing: how options are described
• Ordering: which options appear first
• Categorisation: how options are grouped
• Feedback: what consequences are made visible
• Incentives: what costs and rewards are associated with each option

The key concept is the nudge: a small change to the choice environment that alters behaviour without restricting options. A cafeteria that places salads at eye level and desserts lower down nudges toward healthier eating; nothing is forbidden. Opt-out organ donation defaults nudge toward donation; opting out remains possible.

Choice architecture can be used ethically (safe defaults, clear framing, helpful recommendations) or exploited in dark patterns (confirmshaming, misleading framing, buried opt-outs). The ethical standard is usually whether the architecture serves the user's interest or merely the designer's.