The document discusses the design of a prototype interface for a DVD movie rental machine using Tcl/Tk. It outlines the objectives to create an interface that is usable, efficient, safe, and matches user needs. Design principles of visibility, feedback, consistency, constraints, and mapping are covered. The interface is intended to be affective, easy to learn and remember, and provide a good user experience. Some examples of existing movie rental interfaces are shown, and the program structure of the implemented solution is outlined.
