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Jackson Structured Programming was similar to [[Warnier/Orr Diagrams|Warnier/Orr structured programming]]<ref>{{Citation | first = JD | last = Warnier | year = 1974 | title = Logical Construction of Programs | publisher = Van Nostrand Reinhold | place = NY}}</ref><ref>{{Citation | first = KT | last = Orr | year = 1980 | contribution = Structured programming in the 1980s | title = Proceedings of the ACM 1980 Annual Conference | publisher = ACM Press | place = New York, NY | pages = 323–26 | doi = 10.1145/800176.809987 | isbn = 978-0897910286 }}</ref> although JSP considered both input and output data structures while the Warnier/Orr method focused almost exclusively on the structure of the output stream.
At the time that JSP was developed, programs typically treated an input file as a sequence of records, so that all programs had the same structure— a single main loop that processed all of the records in the file, one at a time. Jackson asserted that this program structure was almost always wrong, and encouraged programmers to look for more complex data structures. In Chapter 3 of ''Principles of Program Design''
== Structural equivalent ==
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