Task 5

1. List five of the eleven usability heuristic for judging the usability of computer systems and eccommerce web sites provided by Nielsen and other !
2. What are five objectives for designing user interface ?


Answer :

1. - Provide appropiate feedback to users.
   - Generate usable queries.
   - Improve productivity of computer users.
   - Match the user interface to the task.
   - Make the user interface efficient.


2. - Visibility of system status :
       The system should always keep users informed about what is going on, through appropriate feedback within reasonable time.
    - Match between system and the real world :
       The system should speak the users' language, with words, phrases and concepts familiar to the user, rather than system-oriented terms. Follow real-world conventions, making information appear in a natural and logical order.
    - User control and freedom:
      Users often choose system functions by mistake and will need a clearly marked "emergency exit" to leave the unwanted state without having to go through an extended dialogue. Support undo and redo.
    - Consistency and standards :
       Users should not have to wonder whether different words, situations, or actions mean the same thing. Follow platform conventions.
    - Help users recognize, diagnose, and recover from errors :
       Error messages should be expressed in plain language (no codes), precisely indicate the problem, and constructively suggest a solution.