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Published in:
2009 | OriginalPaper | Chapter
A Goal-Based Modeling Approach to Develop Requirements of an Adaptive System with Environmental Uncertainty
Authors : Betty H. C. Cheng, Pete Sawyer, Nelly Bencomo, Jon Whittle
Published in: Model Driven Engineering Languages and Systems
Publisher: Springer Berlin Heidelberg
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Dynamically adaptive systems (DASs) are intended to monitor the execution environment and then dynamically adapt their behavior in response to changing environmental conditions. The uncertainty of the execution environment is a major motivation for dynamic adaptation; it is impossible to know at development time all of the possible combinations of environmental conditions that will be encountered. To date, the work performed in requirements engineering for a DAS includes requirements monitoring and reasoning about the correctness of adaptations, where the DAS requirements are assumed to exist. This paper introduces a goal-based modeling approach to develop the requirements for a DAS, while explicitly factoring uncertainty into the process and resulting requirements. We introduce a variation of threat modeling to identify sources of uncertainty and demonstrate how the RELAX specification language can be used to specify more flexible requirements within a goal model to handle the uncertainty.