Models,metrics, and management of IS development

Two types of models can assist the information system manager in gaining greater insight into the system development process. They are: isomorphic models that represent cause-effect relationships between certain conditions (e.g., structured techniques) and certain observable states (e.g., productivity change); and paramorphic models that describe an outcome but do not describe the processes or variables that influence the outcome (e.g., estimation of project time or cost). The two models are shown to be interrelated since the relationships of the first model are determinants of the parameters of the second model.IS managers can make significant contributions by developing isomorphic models tailored to their own organizations. However, metrics that measure relevant characteristics of programs and systems are required before substantial progress can be made. Although some initial attempts have been made to develop metris for program quality, program complexity, and programmer skill, much more work remains to be done. In addition, other metries must be developed that will require the involvement of personnel, not only in the computer sciences, but also in information systems, the behavioral sciences, and IS management.