The peak-end rule means users do not remember an experience as a full average. They mostly remember the most intense moment and the ending, so weak endings and bad peaks can ruin good work.

pretty much

your brain hates blank space, so it fills it with the nearest sample: you

In 1993, Barbara Fredrickson and Daniel Kahneman ran a series of experiments with short film clips, some pleasant and some aversive, that varied in length and intensity.

think of it like designing a hotel room while standing in your own bedroom. everything feels obvious because you know where your socks are

annoyingly, no

asking helps, but the chapter is warning you about the gap between what feels true and what survives contact

Nielsen Norman Group: Response Times: The 3 Important Limits.https://www.nngroup.com/articles/response-times-3-important-limits/

yep. people remember the peak and the end is the trap door

then it shows up as users do not average it out

The 1993 cold water study made this concrete in a way that is hard to forget.

make the hidden assumption visible before the review starts

then test the behavior, not just whether the room nods

and if a choice only works for informed, patient, caffeinated people, treat that as a bug

that’s the series tbh

design psychology is mostly noticing the human nonsense before it ships

deal. hydrate first