A Unifying Framework for Structured Analysis and Design by T. H. Tse

By T. H. Tse

Based methodologies are a well-liked and strong instrument in info platforms improvement. many various ones exist, every one making use of a couple of versions and so a specification needs to be switched over from one shape to a different through the improvement strategy. to unravel this challenge, Dr. Tse proposes a unifying framework at the back of well known based types. He techniques the matter from the viewpoints of algebra and type idea. He not just develops the frameworks but in addition illustrates their functional and theoretical usefulness. therefore, this ebook will offer perception for software program engineers into how methodologies should be formalized, and should open up various purposes and difficulties for theoretical laptop scientists.

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Lexical, syntactic and semantic analyses performed by PSA include the following: data definition analysis; volume analysis; static analysis, which checks the syntactic consistency of the input statements; and dynamic analysis, which determines the behavioural properties of the processes. Documentation and reports can be produced interactively. Although PSL can only be input as a textual language and hence is one-dimensional in nature, a set of graphical reports can be generated automatically for the convenience of user verification.

50 Chapter 4 An Initial Algebra Framework Can we do the reverse? That is to say, can we define a unique reversed homomorphism from Yourdon algebra to the initial algebra, and hence get back our term? The answer, unfortunately, is no. It is because quite a few operations are distinct in the term algebra but overlap in Yourdon algebra. For example, all of the operations infiley, outfiley, sourcey and sinky map any data name d into nil y . Another example is that both sequ y and paray give identical results.

Watson Research Center, Yorktown Heights in 1972 (Goguen 1989). 4. 4 ADJ Diagram for the Signature Boolean The sort can be mapped to a carrier A, , , which can be chosen to be a set of strings containing "true", "false", "not", "and" and "or". 2 Algebras 41 The advantage of the algebraic concept lies in the fact that we map the same sort to another carrier ^boolean, which can be the set of strings containing " 7 " , " F " , " - i " , " A " and " v " . The operation symbols can then be mapped to another set of operations.

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