[mamcx]

In general you WANNA see any people using your app.

Read an "accessibility" spec or a requirement or a UX "good practice" is not a substitute for see how people use it!

One of my anecdotes from back in the day: The secretary of a school that use the app I help develop call about problems reading data, that comes in CD. We can't do much by phone so I travel to the town to try to debug on site (bring dev tools in the day where that means diskettes and cds, we were transitioning from FoxPro 2.6 DOS to Visual Fox Windows 95).

Eventually after some time the secretary put the coffee cup in the CD tray.

Go figure!