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Requirements Engineering (RE) focuses on eliciting, modelling, and analyzingthe requirements and environment of a system-to-be in order to design itsspecification. The design of the specification, usually called the RequirementsProblem (RP), is a complex problem solving task, as it involves, for each newsystem-to-be, the discovery and exploration of, and decision making in, new andill-defined problem and solution spaces. The default RP in RE is to design aspecification of the system-to-be which (i) is consistent with givenrequirements and conditions of its environment, and (ii) together withenvironment conditions satisfies requirements. This paper (i) shows that theRequirements Problem for Adaptive Systems (RPAS) is different from, and is nota subclass of the default RP, (ii) gives a formal definition of RPAS, and (iii)discusses implications for future research.

Requirements Problem and Solution Concepts for Adaptive Systems  Engineering, and their Relationship to Mathematical Optimisation, Decision  Analysis, and Expected Utility Theory