Perceived affordances are formed by:

Don Norman's four principles of screen interfaces

Checklist to ensure new users are able to interact accurately and without investing too much time analysing the display

  1. Follow conventional usage, both in choice of images and allowable interactions
  2. Use words to describe the desired action
  3. Use metaphor
  4. Follow a coherent conceptual model, so that once part of the interface is learned, the same principles apply to other parts