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[[Image:JSP RLE output1.png|thumb|240px|Example of a JSP diagram.]]
'''Jackson structured programming''' ('''JSP''') is a method for [[structured programming]] based on correspondences between data stream structure and program structure. JSP structures programs and data in terms of sequences, iterations and selections, and as a consequence it is applied when designing a program's detailed control structure. The method applies to processing of any data structure or data stream that is describable as a hierarchical structure of sequential, optional and iterated elements. This could be a stream of messages that a process reads to invoke and coordinate other modules or objects, or it could be a string of characters in parameters passed to a single operation on an "object" coded in an object-oriented programming language. In other words, it could be either above or below the level where [[Object-oriented programming|object-oriented methods]] are applied <ref>{{Citation | first = R | last = Wieringa | title = A survey of structured and object-oriented software specification methods and techniques | journal = Comput Surv | volume = 30 | issue = 4 |date=Dec 1998 | pages = 459–527 | doi=10.1145/299917.299919| citeseerx = 10.1.1.107.5410 }}.</ref><ref>{{Citation | first1 = Brian | last1 = Henderson-Sellers | author1-link = Brian Henderson-Sellers | first2 = JM | last2 = Edwards | title = The object-oriented systems life cycle | journal =
== Introduction ==
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