Facebook- Something you know well. Point out a few good and a few bad user interface elements. Have you ever tried to get someone (like a parent) to use Facebook? What worked and what did not?
Noteflight - Can you or can’t you assume that the user is a musician, or knows music notation?
Split into groups of 2, each pick a different one from below without checking what it is. Analyze and report back: What’s good and/or bad about each one? Refer back to all the principles