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The objective of this research effort is to perform an object oriented analysis, design and implementation of the graphical user interface (GUI) for the SATool II system. SATool II is a computer Assisted Software Engineering (CASE) workbench developed using Ada and the X Window system. It is designed to serve as an IDEFo graphical project editor and data dictionary editor. IDEF0 is the ICAM Definition Method Zero graphical notation language adopted by the Air Force to produce a function model of a manufacturing system or environment. The Air Force Institute of Technology is conducting on-going research in the use of IDEFo in the requirements analysis phase of the software lifecycle. This thesis describes the object oriented design and implementation of the GUI based on an entity-relationship model developed by earlier research efforts for the IDEFo language. It also describes the integration of the overall SATool II system composed of the essential model, drawing model, machine- independent Ada graphical support environment, and the graphical user interface.