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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