Five high-level categories of information systems functionality (desired, existing, utilized, perceived, and satisfactory), which combine to 18 classes, are presented. The resulting model is referred to as the D.EU.PS. model of information systems use (pronounced `dupes'). Along with the presentation of the classes their validity is argued by use of examples from three case studies. In doing so,
... [Show full abstract] the usefulness of the model as a tool for data collection and analysis within different use-contexts is exemplified.