Yes, Apple at one time had a phenomenal Human Interface Guide for native OS X applications which was based on actual UX testing and research. Things like, "make

Yes, Apple at one time had a phenomenal Human Interface Guide for native OS X applications which was based on actual UX testing and research. Things like, "make your application features discoverable," "clearly delineate functional areas and controls," and "use verb+noun on action buttons." It was Good Stuff and it heavily informed a lot of UX decisions for the prominent Linux desktops at the time. It's still around but I flipped through it recently and it seems to be a mix of the absurdly general ("don't build an app for a specific screen size") to the very specific (MacOS and iOS APIs). Maybe there's some gold buried in there still, but I'm not sure where to find it.