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The requirements roadmap concept is introduced as a solution to the problemof the requirements engineering of adaptive systems. The concept requires a newgeneral definition of the requirements problem which allows for quantitative(numeric) variables, together with qualitative (binary boolean) propositionalvariables, and distinguishes monitored from controlled variables for use incontrol loops. We study the consequences of these changes, and argue that therequirements roadmap concept bridges the gap between current generaldefinitions of the requirements problem and its notion of solution, and theresearch into the relaxation of requirements, the evaluation of their partialsatisfaction, and the monitoring and control of requirements, all topics ofparticular interest in the engineering of requirements for adaptive systems[Cheng et al. 2009]. From the theoretical perspective, we show clearly andformally the fundamental differences between more traditional conception ofrequirements engineering (e.g., Zave & Jackson [1997]) and the requirementsengineering of adaptive systems (from Fickas & Feather [1995], over Letier &van Lamsweerde [2004], and up to Whittle et al. [2010] and the most recentresearch). From the engineering perspective, we define a proto-framework forearly requirements engineering of adaptive systems, which illustrates thefeatures needed in future requirements frameworks for this class of systems.

Mixed-Variable Requirements Roadmaps and their Role in the Requirements Engineering of Adaptive Systems