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Design process and concepts
The document discusses various concepts and methodologies related to software design including design specification modules, design languages like use case diagrams and class diagrams, fundamental design concepts like abstraction and modularity, modular design methods and criteria for evaluation, control terminology, effective modular design principles of high cohesion and low coupling, design heuristics, and ten heuristics for user interface design.
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Design process and concepts
- 1. Design Process andConcepts Saranya.V AP/CSE, Sri Vidya College of Engineering & Technology, Virudhunagar
- 2. Design Specification Modules • Data Design • Architectural Design • Interface Design • Procedural Design
- 3. Design Languages • O-OParadigm – Use Case Diagram • Functional Requirements of the system • Actors – Class Diagram • Static structure of the system and relationships and association between the classes. – State Diagram • Show the permissible states and the transitions. – Sequence Diagram • Show the temporal dependencies between different actions and objects.
- 4. Fundamental software Design concepts • Abstraction – Procedural – Data abstraction • Refinement (improve the design component) • Modularity • Software Architecture • Control Hierarchy or Program Structure • Structure Partitioning • Data Structure • Software Procedure • Information Hiding
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- 6. Modular Design MethodEvaluation Criteria • Modular Decomposability (problem to sub problem) • Modular composability (reuse of existing modules) • Modular Understandability • Modular Protection (minimize the process errors) • Modular Continuity (module changes minimized)
- 7. Control Terminology • Spanof control : (number of levels control within the product) • Depth (distance between top and bottom modules) • Fan-Out or Width: Number of modules controlled by particular module. • Fan-in: Number of modules control the particular module. • Visibility • Connectivity
- 8. Effective Modular Design •Functional dependency – Should have high cohesion and low coupling • Cohesion – Module focus on just one thing • Coupling – Module is connected to other modules and to the outside world.
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- 10. Design heuristic foreffective modularity • Evaluate the first iteration (reduce coupling and increase cohesion) • Minimize the structure with high fan out • Keep the scope of the effect • Reduce complexity • Predictable functions
- 11. Ten Heuristic forUser Interface Design • Visibility of system status • Match between the system and the real world • User control and freedom • Consistency and standards • Error prevention • Recognition rather than recall • Flexibility and efficiency of use • Aesthetic (artistic) and minimalist design • Help users recognize, diagnose and recover from errors. • Help and documentation.