Data flow diagram: a graphical representation of the "flow" of data through an information system. It has zoom levels and it is sequential. The simplified "blueprint" of course registration process was shown in the class.
Entity relationship diagram: an abstract conceptual representation of structured data. It has no sequence and it is project oriented.
Relevant article:
Relevant article:
Jackson System Development Overview
In this article, the author introduces us to the Jackson System Development (JSD), which 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. From the technical point of view there are three major stages in Jackson System Development, each divided into steps and sub-steps. From a manager's point of view there are a number of ways of organizing this technical work. In this overview the author also describe the three major technical stages and discuss about JSD project planning, the variation between plans, and the reasons for choosing one rather than another. what I agree most with the author's opinion on the overlappings between technical stages. A set of circumstances exists that makes each overlapping sensible. Therefore a project plan is made based on the technical framework of JSD and on the political and organizational circumstances of the project.
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