Structured Analysis and Structured Design
Structured Analysis and Structured Design (SASD) is composed of two parts - Structured Analysis and Structured Design. Structured Analysis is composed of an Essential Model, an Environmental Model, a Behavioural Model and lastly an Implementation model. The Essential Model is a model of what the system must do, the Environmental model defines the scope and interaction between the system and the world. The Behavioural Model specifies the required behaviour of the system so that it can interact with it?s environment. Lastly, the implementation model implements the system. The Structured Design section is divided into three levels. The Processor Model assigns processes to processes. The Task Model assigns processes and data to tasks. Lastly, the Program Implementation Model is an internal definition of individual tasks. Structured Design breaks up the program into a hierarchy of modules with a computer program as the result.
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