There is, perhaps, no more visible financial dilemma in the software industry today than that of software piracy. In this paper, we detail the development and empirical validation of a predictive model of software piracy behavior by computer-using professionals. The model was developed from the results of prior research in software piracy and the reference disciplines of the theory of planned behavior, expected utility theory and deterrence theory. The study utilized two methods to analyze the piracy decision. A survey was used to test the entire model and an experiment was undertaken to test several relationships between the included variables. The results indicate that the identified factors have a significant impact on the decision to pirate software and that the model is a useful tool in further understanding this behavior. The results add to a growing stream of MIS research into piracy behavior and have significant implications for organizations and industry groups aiming to reduce piracy behavior.