It starts with a mindset, that every design decision they make affects user emotion in a positive or negative way. Obviously, that means iteration needs to tip the scales to positive emotions, and to do that, the team follows the guiding rationale of psychologist Barbara L. Fredrickson, who discovered that it takes three positive emotions to outweigh every negative one.
Interesting application of psychology theory to make design decisions. Good work Google.
Google’s Dead-Simple Tool For Making UX Decisions
Google’s Dead-Simple Tool For Making UX Decisions