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Jackson System Development (JSD) is a method of system development that covers the software life cycle either directly or, by providing a framework into which more specialized techniques can fit. Jackson System Development can start from the stage in a project when there is only a general statement of requirements.
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 [1] Jackson presents two versions of a program, one designed using JSP, the other using the traditional single-loop structure. Here is his example, translated ...
The Jackson System Development (JSD) was the second software development method that Jackson developed. [9] JSD is a system development method not just for individual programs, but for entire systems. JSD is most readily applicable to information systems, but it can easily be extended to the development of real-time embedded systems. JSD was ...
Here is Jackson's description of examining the problem context, in this case the context for a bridge to be built: You're an engineer planning to build a bridge across a river. So you visit the site. Standing on one bank of the river, you look at the surrounding land, and at the river traffic.
Flow-based programming defines applications using the metaphor of a "data factory". It views an application not as a single, sequential process, which starts at a point in time, and then does one thing at a time until it is finished, but as a network of asynchronous processes communicating by means of streams of structured data chunks, called "information packets" (IPs).
Jackson is Editor-in-chief of the journal Systems Research and Behavioral Science, published by John Wiley, and he is on the editorial board of 5 other journals. He has delivered plenary addresses at numerous international conferences, and has undertaken many consultancy engagements with outside organisations, both commercial and non-profit.
The waterfall model is a breakdown of developmental activities into linear sequential phases, meaning that each phase is passed down onto each other, where each phase depends on the deliverables of the previous one and corresponds to a specialization of tasks. [1]
Structured systems analysis and design method (SSADM) is a systems approach to the analysis and design of information systems. SSADM was produced for the Central Computer and Telecommunications Agency , a UK government office concerned with the use of technology in government, from 1980 onwards.