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  Software Design Process

Introduction to Software Design Process

The software design  process basically  follows an ordered sequence of step which must be followed one by one  to achieve final  product. A software design  process can be  seen  in many perspectives that are:

1 . Design Requirements and Criteria

2. Design Levels and Their Objectives

3. IPO Approach

4. Design  Tools

1.Design Requirements and Criteria

A design for a software  product should provide the  information about the desired output required  environment  and economic conditions etc. So  a  design can also be regarded as a detailed plan for a solution  to a problem. To follow the design requirements and criteria  there is a generic design process whose steps are followed in  sequence as  shown in fig  5.10.

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In this generic design  process, design usually proceeds in levels. As the result from previous design level are achieved, then the process of design level starts step by step. First the appropriate data and information are collected which are related to the  problem. Then an evaluation criteria is established to have physical realizations. Realization refers to the development of a solution to problem posed in the requirements.

At lest two realization are  synthesized from them. Now the  realization is analyzed, evaluated and ranked in terms of the established criteria. After that  the best realization is chosen and proceed to next design level otherwise  the realization, evaluation criteria and problem  definition are revised until the best design is achieved.

At the  completion of each step a review is planned. Reviews  are planned to verify  the outcome of each step.

2.Design Levels and Their Objectives

From a system perspective  design process is  stepped down as shown in fig 5.11, they  are seen as a serried of discrete levels. Each level begins with a list of requirements  and produces some form of realization which further acts as the input for next level.

852_Design Levels Homework Help.jpg

This design process continues  until the next realization  is in a physical  form that is the design level produces result that are  in the form  of a specification for a  specific physical realization in hardware or software. At each  level there is  an elaboration of problem understanding an increase in the detail of problem space descriptions and a better appreciation of  conditions limiting  solution  options.

Generally this  process leads to an architecture or structure and  progresses in top down manner. Then at each design level the architecture is an  extension of the top level architecture.

3.Input/Process / Output (IPO) Approach

In this  approach for each level or step a definite input  is required transform to the  input into a definite output. This approach is shown in fig 5.12, there is also a feedback path. By regarding  each level and each step within each level as an input /process / output procedure , it  is easier to  concentrate on:

1. What product is expected from the design activity?

2. What must  be done  with the  input?

3. Which type of inputs  are required?

4.Design Tools

A number  of tools  are available  to the designer to support design activities as shown in table5.1, some  design tools shown  a structured sequence of design step guide the  designer and produce a documentation set that  captures the  subject design.

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