Specifications - Martin Fowler

1 Specificationsby Eric Evans and Martin Fowler of the nice things about working in Silicon Valley is that almost any time of the year you canwalk around outside while discussing some design point. Due to serious follicle impairment Martinneeds to wear a hat when doing this in the sunshine. Eric was talking to him about the problems ofmatching shipping services to the requests customers make and the similar process as the shippermakes requests to contractors. There was some similarity here that suggested an abstraction. Eric hadbeen using a model he called " specification " to represent the requirements for a route and to ensurethat cargoes were stored in proper containers. Martin had come across similar problems before. In atrading system people were responsible for looking at the risk implied by some subset of the bank scontracts. Healthcare observations could be made on a population to indicate typical ranges of somephenomenon type (such as the breathing flow for a heavy smoker in his 60 s).

Specification uses an interpreter [Gang of Four] to cut a very agreeable middle path. The programmers provide basic elements of the specification and ways to combine them, later users can then assemble specifications with a great deal flexibility. Once you have used specification, a powerful pattern that builds on it is Subsumption. The usual ...

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