Introduction of Software Design
Design is the first and must step in the development of any engineered product. It can be stated as design is the process of applying various techniques and principles for the purpose of defining a device a process or a system in sufficient detail to permit its realization. The design activity begins after completion of analysis activity where the analysis document is a available for the development. Such requirement document tells all about the problem to be solved. So the design and its component parts should follow an ordered sequence of steps to solve the problem . design is the creative process of transforming the problem into a solution by following and ordered sequence of step.
Design is basically a much more creative process that analysis. It involves working with the unknown new system rather than analyzing the known system. A good design is required which is very dependent on a particular system as a good design for one system may be bad for another system. It is not possible therefore to propose set of standard solution form which to select a good design for any system. Instead design requires considerable creativity to propose the necessary system specific changes and additions that are both acceptable to users and easy to implement. The designer together with users has to search for a solution using any special knowledge about the system until there is an agreement that a satisfactory solution has been found.
One question that is after asked is when is the design complete? The answer to some extent is that design is an ongoing process but its nature changes as the development process proceeds. Thus design is needed to define the concept. Then during specification the new system and its requirement are designed. In software design one designs the best computer structures the programs and so on. During this time ,one can always clarify issues and problems and think possible things be could do although he does not necessarily put them done on paper at least not in a formal document.
This approach to design is consistent with the top down approach of the waterfall cycle. Design models are developed throughout the cycle, being gradually reduced from higher level user world terms into detailed implementation models.
What is the software Design?
As we have seen that the design activity is a fundamental step in the development process that transforms the software requirements. Through a number of sequential steps into a final product. Its output is a software design. So the software design can be defined as:
A software decomposition into modules description of what each module is intended to do and of the relationships among the modules.
Such type of description is called as the software architecture or the software structure. Thus the goal of the design activity is the definition of the software architecture.
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