Page 142 - DCAP405_SOFTWARE_ENGINEERING

Unit 8: Design Engineering

other modules and thousands of other details that he cannot possibly worry about at the Notes
same time.

 A modular design reduces the design complexity and results in easier and faster
implementation by allowing parallel development of different parts of a system.

8.6 Keywords

Coupling: Coupling is an internal software attribute that can be used to indicate the degree of
interdependence among the components of a software system.
Dependency Inversion Principle: Dependency Inversion Principle states that we should decouple
high level modules from low level modules.

Design Patterns: A software design pattern describes a family of solutions to a software design
problem.
Modular Design: A modular design reduces the design complexity and results in easier and
faster implementation by allowing parallel development of different parts of a system.

8.7 Review Questions

1. In software engineering why do we desperately need good design at all levels?
2. Explain with example that how the modular design reduces the design complexity?

3. “Software Design is more an art than a science.” Analyze.
4. Clients should not be forced to depend upon interfaces that they don’t use. Explain.
5. Discuss the set of guidelines provided by the software design principles that helps to
avoid having a bad design.
6. Dependency Inversion and Inversion of Control have the same meaning? Why or why
not? Explain briefly.

7. A good design is the one that has low coupling. Explain.
8. Engineering is more about how you do the process than it is about what the final product
looks like. Discuss.

9. The design of software is often depicted by graphs that show components and their
relationships. Comment.
10. “Two modules that are tightly coupled are strongly dependent on each other.” Explain
why?

Answers: Self Assessment

1. planning 2. complexity
3. software 4. domains

5. Software development 6. details
7. substitutable 8. build/test
9. problem 10. run-time
11. documenting 12. Class diagrams

LOVELY PROFESSIONAL UNIVERSITY 135