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  Characteristics of a Good Design

Characteristics of a Good Design

There are some characteristics which a good design must have to achieve good quality products. Mc Glanghlin has suggested three characteristics of a good design.

The  design must implement all of the explicit requirement contained in the analysis model, and  it must accommodate all of the implicit requirements desired by the  customer.

The design must be a readable, understandable guide for those who generate code and for those who test and subsequently support  software.

The design should provide complete picture of the  software addressing the data ,  functional and behavioural domains from an implementation perspective.

Design Principles

The goal of a good software designs to satisfy the requirements of the customers. So there should be some design principle  which can lead the  software  engineer to achieves  a good designed product. Davis s have suggested a list of design principles given below:

1. The design process should not suffer from tunnel vision  : A good designer  should  incorporate the various alternative  approaches.

2. The design should be traceable to the analysis model. It  is essential to have some  way to see that requirements have been  satisfied by the design model.

3. The design should  not reinvent the wheel  : As time  is short and resources are limited so design time should be invested   in representing truly new  ideas, not to  check the  previously generated components.

4. The design should minimize the intellectual  distance between  the  software and  the problem as it exists in the  world. The  should  follow  the same idea of the problem so that the  developed product will be according  to needs of the  problem.

5. The design should exhibit uniformity and integration: The style  and format should  be  in form and same   across the  entire design. And all the  design modules ( or  components) should  be properly  integrated through interface.

6. The design should be structured to accommodate change : The design should be structured so as to be amenable to  change. And also maintenance should be easily and properly done.

7. The design should be structured to degrade gentry even when  aberrant data  events or operating conditions are encountered. It  should  be designed to accommodate unusual and unexpected condition in a proper manner.

8. Design is not  coding, coding  is not  design: Both are different  phase of the level  orpiment process. For an example in the design  we write pseudo code in general English whereas in coding we use a particular programming language to write code.

9. The design should be assessed for quality as it is being created not after the  fact. During the design phase, it is needed  that we should consider the quality  concern regularly at each step.

10. The design should be reviewed to  minimize conceptual errors: To minimize the errors, the design should be reviewed formally and proper consideration should be given on ambiguity, omissions inconsistencies etc.

When these design  principle are properly applied, the software engineer creates a  design of good quality.

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