Design Guidelines
There is no magic formula for software design. Design is a creative process that can be guided and directed but it can never be reduced to an algorithmic procedure. The design of real time system is a much different application. The following guidelines do not constitute a design methodology but rather provide some guidance for organizing the activities of software design:
1. Review the requirement specification . in particular study the desired functional characteristics and performance attributes of the system.
2. Review and expand the external interfaces, user dialogues and report formats developed during requirements analysis.
3. Review and refine the data flow diagrams developed during requirements analysis and external design. Identify internal data stores and elaborate the processing functions.
4. Indentify function abstraction and data abstraction. Record them using a design notation.
5. Define the visible interfaces for each functional abstraction and each data abstraction. Record them using a design notation.
6. Define the modularization criteria to be used in establishing system structure.
7. Apply the techniques of your particular design method to establish system structure. For example derive a system structure that maximizes information hiding.
8. Iterate step 4 and 7 and as necessary steps 1 through 7 until a suitable structure is achieved.
9. Verify that the resulting system structure satisfies the requirements.
10. Develop interfaces specification for the procedures in each module.
11. Conduct the preliminary design review. The level of detail should be inclusive of levels 1 and 2 of the procedure templates.
12. Develop concrete data representation for the data stores and data abstractions.
13. Expand the procedure templates to include the information inlevel3.
14. Specify algorithmic details for the body of each procedure in the system using successive refinements, HIPO diagrams pseudo code, structured English and structured flowcharts. Develop concrete data representations and interconnection between data structures and algorithms.
15. Conduct the critical design review.
16. Redesign as necessary.
The major difficulties in software design are caused by inadequate requirements, failure to consider alternative design strategies and the temptation to provide too much detail too soon. A great deal of iteration among the various design steps is to be expected as understanding the problem and various possibilities for solutions improvement.
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