Os princípios da usabilidade que correspondem a assertiva são:
•Speak the users' language: The dialogue should be expressed clearly in words, phrases, and concepts familiar to the user, rather than in system-oriented terms.
•Feedback: The system should always keep users informed about what is going on, through appropriate feedback within reasonable time.
•Help and documentation: Even though it is better if the system can be used without documentation, it may be necessary to provide help and documentation. Any such information should be easy to search, be focused on the user's task, list concrete steps to be carried out, and not be too large.
Jakob Nielsen, Usabilty Engineering, 1993
pag 20.