The product development process suffers from multitasking. Everybody is bad at multitasking, and people who think they are good at it, actually perform worse, they just don’t realize it.

The Overton window of multitasking is shifting with time. A Miss Manners book from 1999 (Miss Manners’ Guide to Domestic Tranquility) uses the example of listening to music while studying as an unthinkable distraction.