1. Checkland, P., Scholes, J.: Soft Systems Methodology in Practice. J. Wiley, Chichester (1990)
2. Cleven, A., Gubler, P., Hüner, K.: Design Alternatives for the Evaluation of Design Science Research Artifacts. In: Proceedings of the 4th International Conference on Design Science Research in Information Systems and Technology (DESRIST 2009). ACM Press, Malvern (2009)
3. Gregor, S., Jones, D.: The Anatomy of a Design Theory. Journal of the Association for Information Systems 8, 312–335 (2007)
4. Gummesson, E.: Qualitative Methods in Management Research. Studentlitterature, Chartwell-Bratt, Lund, Sweden (1988)
5. Hevner, A.R., March, S.T., Park, J., Ram, S.: Design Science In Information Systems Research. MIS Quarterly 28, 75–105 (2004)