Abstract
The lack of flexibility is often seen as an inhibitor for the successful application of workflow technology. Many researchers have proposed different ways of addressing this problem and some of these ideas have been implemented in commercial systems. However, a “one size fits all” approach is likely to fail because, depending on the situation (i.e., characteristics of processes and people involved), different types of flexibility are needed. In fact within a single process/organisation varying degrees of flexibility may be required, e.g., the front-office part of the process may require more flexibility while the back-office part requires more control. This triggers the question whether different styles of flexibility can be mixed and integrated into one system. This paper proposes the Flexibility as a Service (FAAS) approach which is inspired by the Service Oriented Architecture (SOA) and our taxonomy of flexibility. Activities in the process are linked to services. Different services may implement the corresponding activities using different workflow languages. This way different styles of modelling may be mixed and nested in any way appropriate. This paper demonstrates the FAAS approach using the Yawl, Declare, and Worklet services.
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References
van der Aalst, W.M.P., Aldred, L., Dumas, M., ter Hofstede, A.H.M.: Design and implementation of the YAWL system. In: Persson, A., Stirna, J. (eds.) CAiSE 2004. LNCS, vol. 3084, pp. 142–159. Springer, Heidelberg (2004)
van der Aalst, W.M.P., van Hee, K.M.: Workflow Management: Models, Methods, and Systems. MIT Press, Cambridge (2004)
van der Aalst, W.M.P., ter Hofstede, A.H.M.: YAWL: Yet Another Workflow Language. Information Systems 30(4), 245–275 (2005)
van der Aalst, W.M.P., ter Hofstede, A.H.M., Kiepuszewski, B., Barros, A.P.: Workflow Patterns. Distributed and Parallel Databases 14(1), 5–51 (2003)
van der Aalst, W.M.P., Jablonski, S.: Dealing with Workflow Change: Identification of Issues and Solutions. International Journal of Computer Systems, Science, and Engineering 15(5), 267–276 (2000)
van der Aalst, W.M.P., Pesic, M.: DecSerFlow: Towards a truly declarative service flow language. In: Bravetti, M., Núñez, M., Zavattaro, G. (eds.) WS-FM 2006. LNCS, vol. 4184, pp. 1–23. Springer, Heidelberg (2006)
van der Aalst, W.M.P., Weske, M., Grünbauer, D.: Case Handling: A New Paradigm for Business Process Support. Data and Knowledge Engineering 53(2), 129–162 (2005)
Adams, M., ter Hofstede, A.H.M., van der Aalst, W.M.P., Edmond, D.: Dynamic, extensible and context-aware exception handling for workflows. In: Meersman, R., Tari, Z. (eds.) OTM 2007, Part I. LNCS, vol. 4803, pp. 95–112. Springer, Heidelberg (2007)
Adams, M., ter Hofstede, A.H.M., Edmond, D., van der Aalst, W.M.P.: Worklets: A service-oriented implementation of dynamic flexibility in workflows. In: Meersman, R., Tari, Z. (eds.) OTM 2006. LNCS, vol. 4275, pp. 291–308. Springer, Heidelberg (2006)
Casati, F., Ceri, S., Paraboschi, S., Pozzi, G.: Specification and Implementation of Exceptions in Workflow Management Systems. ACM Transations on Database Systems 24(3), 405–451 (1999)
Compton, P., Jansen, B.: Knowledge in context: A strategy for expert system maintenance. In: Barter, C.J., Brooks, M.J. (eds.) Canadian AI 1988. LNCS, vol. 406, pp. 292–306. Springer, Heidelberg (1990)
Ellis, C.A., Keddara, K., Rozenberg, G.: Dynamic change within workflow systems. In: Comstock, N., Ellis, C., Kling, R., Mylopoulos, J., Kaplan, S. (eds.) ACM SIGOIS, Proceedings of the Conference on Organizational Computing Systems, Milpitas, California, pp. 10–21. ACM Press, New York (1995)
Georgakopoulos, D., Hornick, M., Sheth, A.: An Overview of Workflow Management: From Process Modeling to Workflow Automation Infrastructure. Distributed and Parallel Databases 3, 119–153 (1995)
Heinl, P., Horn, S., Jablonski, S., Neeb, J., Stein, K., Teschke, M.: A Comprehensive Approach to Flexibility in Workflow Management Systems. In: Georgakopoulos, G., Prinz, W., Wolf, A.L. (eds.) Work Activities Coordination and Collaboration (WACC 1999), pp. 79–88. ACM Press, San Francisco (1999)
Kloppmann, M., Koenig, D., Leymann, F., Pfau, G., Rickayzen, A., von Riegen, C., Schmidt, P., Trickovic, I.: WS-BPEL Extension for People BPEL4People. IBM Corporation (2005), http://www-128.ibm.com/developerworks/webservices/library/specification/ws-bpel4people/
Leymann, F., Roller, D.: Production Workflow: Concepts and Techniques. Prentice-Hall PTR, Upper Saddle River (1999)
Pesic, M., Schonenberg, M.H., Sidorova, N., van der Aalst, W.M.P.: Constraint-Based Workflow Models: Change Made Easy. In: Meersman, R., Tari, Z. (eds.) OTM 2007, Part I. LNCS, vol. 4803, pp. 77–94. Springer, Heidelberg (2007)
Pnueli, A.: The Temporal Logic of Programs. In: Proceedings of the 18th IEEE Annual Symposium on the Foundations of Computer Science, pp. 46–57. IEEE Computer Society Press, Providence (1977)
Reichert, M., Dadam, P.: ADEPTflex: Supporting Dynamic Changes of Workflow without Loosing Control. Journal of Intelligent Information Systems 10(2), 93–129 (1998)
Rinderle, S., Reichert, M., Dadam, P.: Correctness Criteria For Dynamic Changes in Workflow Systems: A Survey. Data and Knowledge Engineering 50(1), 9–34 (2004)
Russell, N., van der Aalst, W.M.P., ter Hofstede, A.H.M.: Workflow exception patterns. In: Dubois, E., Pohl, K. (eds.) CAiSE 2006. LNCS, vol. 4001, pp. 288–302. Springer, Heidelberg (2006)
Sadiq, S., Sadiq, W., Orlowska, M.: Pockets of flexibility in workflow specification. In: Kunii, H.S., Jajodia, S., Sølvberg, A. (eds.) ER 2001. LNCS, vol. 2224, pp. 513–526. Springer, Heidelberg (2001)
Schonenberg, M.H., Mans, R.S., Russell, N.C., Mulyar, N.A., van der Aalst, W.M.P.: Towards a Taxonomy of Process Flexibility (Extended Version). BPM Center Report BPM-07-11, BPMcenter.org (2007)
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van der Aalst, W.M.P., Adams, M., ter Hofstede, A.H.M., Pesic, M., Schonenberg, H. (2009). Flexibility as a Service. In: Chen, L., Liu, C., Liu, Q., Deng, K. (eds) Database Systems for Advanced Applications. DASFAA 2009. Lecture Notes in Computer Science, vol 5667. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04205-8_27
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