GPT.EXE: A powerful tool for the visualization and analysis of general processing tree models

This paper introduces GPT.EXE, a computer program for designing and impleme nting general processing tree (GPT) models. First, designing and building G PT models using this program is discussed. The second major emphasis is a d escription of various statistical procedures that can be carried out with G PT.EXE. There is also a brief section on the on-line documentation of this program. Throughout the text, pictures of windows from the program are disp layed to help explain the procedures being described by the text.