Development of Software Design Model
After having a brief overview about the software design, now we will see how a software design model is developed. The design model is developed by the software designer only whose main goal is to develop a model or abstraction of the product based on experience design principles its guidelines, heuristics and fundamental concepts. This model is then evaluated with respect to the requirement s( or the analysis model) and operating and economic environments. The design process goes through some stepwise refinements until a physical realization comes into existence.
The fig 5.1, show how the analysis model developed during analysis phase is translated into the design model. The design model consists of four design models (elements) in the form of a pyramid. All design models are developed by using the elements of the analysis model as given below:
Data design requires data dictionary and entity relationship diagram
The data object and their relationship obtained by entity relationship diagrams and the data details from the data dictionary made during the analysis phase provides the ground for the creation of the data model of a software. This information serves as the base for the creation of data structures of the software solution.
Architectural design consists of data flow diagrams .it depicts the relationships between major structural elements of the software various design patterns and various design pattern constraints.
Interface design require control specification state transition diagrams and data flow diagrams. It depicts the inter communication path of the software i.e.it describes this user computer interaction, the communication with any other required system or within in self.
Component level design involves the control specification state transition diagram and process specification. It converts the structural components of the software architecture into a procedural of the software components.
In this manner, the requirements through analysis model can be translated into the software design. This model serves as the base of the coding phase. So design is the only tool that depicts the transformations of customer requirements into finished software product. Design also describes the quality of the software work product, which goes throughout the life cycle phases coding testing and maintenance.
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Groups must generally prepare a statement of cash flows which follows the same logic like the statement of financial position and income statement .
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