People who work on the user interface side need to have empathy as a key characteristic. But if you are writing device drivers you don't really need to understand humans so well.
Andy HertzfeldBut typically for a project like the Mac, the size we had was pretty good. And it has different stages. The team grows as you have to write manuals and do testing... though the Mac had no formal testing.
Andy HertzfeldI knew the Apple II was great when I bought it, but as I dug into the details it just completely blew me away the creative artistic approach that the designers had taken.
Andy Hertzfeld