A. Basic Considerations on Design and Implementation of Computer-based Information Systems.- I. Introduction.- 1. State of the Art of Implementation Research on Computer-based Information Systems.- 1. Introduction.- 2. Basic Notes on the Implementation Game.- 3. Contributions from Research to System Design and Implementation.- 4. Some Preliminary Remarks on Consequences for Implementation Research.- 2. Evaluating the Quality of Information Systems.- 1. Introduction.- 2. Conceptual and Operational Issues.- 3. A Survey of the Research Literature.- 4. Conclusion.- II. Technical Aspects of Systems Design and Implementation.- 3. The Modeling Process: Steps Versus Components.- I. The Topic.- 2. The Role of the Model.- 3. The Plea for the Assemblage-of-Components Concept.- 4. The Components of the Modeling Process.- 5. Modeling, an Art or a Science?.- 4. Implementation of Planning Models: Presentation of the APIS Approach.- 1. Introduction.- 2. Diagnosis of Problem Areas.- 3. Consequences in the APIS Project.- 4. APIS Results.- 5. Conclusion.- III. Organizational Aspects of Systems Design and Implementation.- 5. Basic Considerations in Organizational and Human Aspects in Systems Design: the State of the Art of Implementation Research.- 1. Introduction.- 2. Approaches to Implementation Research.- 3. Research Designs.- 4. Three Examples.- 5. Future Research.- 6. A Design-Oriented Approach in Implementation Research: The Project PORGI.- 1. Statement of the Problem.- 2. Research Design of Project PORGI.- 3. PORGI-Implementation Handbook: The Concept.- B. Working Group: Technical Aspects of Systems Design and Implementation.- I. Selection of Planning Methods.- 7. The Feasibility of Linear Planning Models in Business Administration.- 1. Survey.- 2. Methods and Tools for Planning.- 3. Implementation of the Planning System.- 4. Problems of Evolution.- 5. Feasibility Problems.- 6. Future Development.- 8. Application Areas for Planning Software.- 1. The Purpose of Planning Software.l3*