Choices and persuasion
Affect heuristic
People's feelings about something shape how they judge its risks and benefits: if they like it, they see it as safer and more useful.
People don't weigh risk and benefit separately. When something feels good, both its risks seem lower and its benefits higher, and the reverse when it feels bad.
First impressions and mood matter more than the feature list. A calm, clear experience makes the same product seem safer and more capable.
In practice
A banking app with a reassuring, plainly written error message tends to be judged more secure than one showing a cryptic error code.
Common mistake
Using pleasant design to distract from a real risk, such as hiding fees behind a cheerful sign-up flow.
Where it comes from
Described by Melissa Finucane, Ali Alhakami, Paul Slovic and Stephen Johnson in 2000, and developed by Slovic and colleagues in 2002.