Command entry
      Difficult to learn and to retain
      Can be very efficient for trained users
Recommended for frequent users only (and for work under time pressure)

Menus
      Easy to learn and to retain
      Slows experienced users down
    Recommended for all users when complemented by menu commands

Direct manipulation
      Relatively easy to learn, easy to retain
      Restricted in scope
Recommended for all users when icons are labeled and when
            direct manipulation is complemented by other interaction style(s)

(Form fill-in)
     Limited in scope

(Natural-language interaction)
    Technical limitations