Specification of interface interaction objects

User Interface Management Systems have significantly reduced the effort required to build a user interface. However, current systems assume a set of standard "widgets " and make no provisions for defining new ones. This forces user interface designers to either do without or laboriously build new widgets with code. The Interface Object Graph is presented as a method for specifying and communicating the design of interaction objects or widgets. Two sample specifications are presented, one for a secure switch and the other for a two dimensional graphical browser. 1INTRODUCTION Specification of user interfaces has been used to aid in the design of user-computer dialog and software. This work has led to the development of User Interface Management Systems or UIMSs. These systems significantly reduce the work required to design and specify a user-computer dialog. They also allow non-programmers to prototype and design complex user interfaces. However, current UIMSs assume that a set of primitives (interaction objects or widgets) exist and manipulate the presentation of these objects. If none of the interaction objects are quite what the designer wants, then either the designer must compromise and redesign the dialog with the interaction objects provided o