JLUC sayz:
Sharing that list of UI and UX principles and reminders :
https://spreadsheets.google.com/pub?key=tJxF8zTuLdEj9pUcxnLAemA&output=html
It's originating from Mozilla but it can apply well to scribus and i think it can be helpfull in describing some UI/UX issues and in designing new solutions - before coding them -.