Large, Andy creator text 1991 monographic Examines elements which enable the user to interact with the program and data, viz. command languages, full-screen menus, pull-down/pop-up menus, command menus, direct manipulation and natural language. Also discusses display features and user assistance, and notes that the user interface is crucial to the acceptance of any software programs. 3/7/00 M2LMGR 20260716043309.0