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Lookup NU author(s): Dr Joey Coleman
Creating the specification of a system by focusing primarily on the detailed properties of the digital controller can lead to complex descriptions that are nearly incoherent. An argument given by Hayes, Jackson, and Jones provides reasons to focus first on the wider environment in which the system will reside. In their approach are two major ideas: pushing out the specification boundaries, and carefully distinguishing between the requirements of the system and the assumptions about the environment. Pushing out the boundaries of the system specification to include the pragmatic intent of the system being specified allows the specification to be understood relative to the environmental context, rather than remaining a mysterious black box in isolation. Clarifying the distinction between assumptions about the environment and requirements that the specification must meet increases the clarity of the specification, and has the potential to seriously reduce the complexity of the final specification. The example of a gas burner is explored in depth to illustrate this approach to system specification.
Author(s): Coleman JW
Publication type: Report
Publication status: Published
Series Title: School of Computing Science Technical Report Series
Year: 2006
Pages: 22
Print publication date: 01/05/2006
Source Publication Date: May 2006
Report Number: 974
Institution: School of Computing Science, University of Newcastle upon Tyne
Place Published: Newcastle upon Tyne
URL: http://www.cs.ncl.ac.uk/publications/trs/papers/974.pdf
