Flexibility and efficiency of use heuristic principle is about giving your users ways to speed up their work with more efficiency and flexibility. It’s the seventh heuristics guideline of Nielsen’s Heuristics. Put in Nielsen’s words, Accelerators — unseen by the novice user — may often speed up the interaction for the expert user such that the…

Undoubtedly, a good product should inform its users about an error, but the best products are those which prevent an error to happen in the first place. A good UX anticipates an error and helps users with error prevention. It’s the fifth guideline of Nielsen’s Heuristics. Put in Nielson’s word, Even better than good error…