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Traditionally, practitioners use formal methods pre-dominately for one halfof the quality-assurance process: verification (do we build the softwareright?). The other half -- validation (do we build the right software?) -- hasbeen given comparatively little attention. While verification is the core ofrefinement-based formal methods, where each new refinement step must preserveall properties of its abstract model, validation is usually postponed until thelatest stages of the development, when models can be automatically executed.Thus mistakes in requirements or in their interpretation are caught too late:usually at the end of the development process. In this paper, we present anovel approach to check compliance between requirements and their formalrefinement-based specification during the earlier stages of development. Ourproposed approach -- "validation obligations" -- is based on the simple ideathat both verification and validation are an integral part of all refinementsteps of a system.

Validation Obligations: A Novel Approach to Check Compliance between Requirements and their Formal Specification