DeLone and McLean’s (1992) model of information systems success has received much attention among researchers. This study applies an adaptation of the full DeLone and McLean model, for the first time, in the user developer domain. Of the nine hypotheses derived from the model, four were found to be significant and the remainder not significant. There was strong support for the proposed relationships between perceived system quality and user satisfaction, perceived information quality and user satisfaction, user satisfaction and intended use, and user satisfaction and perceived individual impact. This study indicates that user perceptions of information systems success play a significant role in the user developed application domain. There was, however, no relationship between user developers’ perceptions of system quality and independent experts’ evaluations, and user ratings of individual impact were not associated with organizational impact measured as company performance in a business simulation. Further research is required to understand the relationship between user perceptions of information systems success and objective measures of success, and to provide a model of information systems success appropriate to end user development.