system development approaches - structure chart There are...

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The Structured Approach Structured System Development: Structured analysis, structured design, and structured programming are the three techniques that make up the structured approach . Sometimes, these techniques are collectively referred to as the structured analysis and design technique (SADT). Structured programming produces a program that has one beginning and one ending, with each step in the program execution consisting of one of three programming constructs: A sequence of program statements A decision point at which one set or another set of statements executes A repetition of a set of statements Top-down programming divides more complex programs into a hierarchy of program modules (see Figure 8-13). One module at the top of the hierarchy controls program execution by “calling” lowerlevel modules as required. The modules and the arrangement of modules are shown graphically by using a model called a
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Unformatted text preview: structure chart . There are two main principles of structured design : Program modules should be (1) loosely coupled and (2) highly cohesive. Loosely coupled means that each module is as independent of the other modules. Highly cohesive means that each module accomplishes one clear task. The structured analysis technique helps the developer define what the system needs to do (the processing requirements), what data the system needs to store and use (data requirements), what inputs and outputs are needed, and how the functions work together to accomplish tasks. The key graphical model of the system requirements that are used with structured analysis is called the data flow diagram (DFD) . A model of the needed data is also created based on the types of things the system needs to store information (data entities) about. The data modeling is done with the entity-relationship diagram....
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