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Software Processes

This lecture covers software process models, including the waterfall model, evolutionary development, and component-based software engineering. It also introduces Computer-aided software engineering (CASE) technology to support software development and evolution processes.

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Software Processes

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  1. Software Processes IS301 – Software Engineering Lecture # 4 – 2004-09-08 M. E. Kabay, PhD, CISSP Assoc. Prof. Information AssuranceDivision of Business & Management, Norwich University mailto:mkabay@norwich.edu V: 802.479.7937

  2. Objectives • To introduce software process models • To describe three generic process models and when they may be used • To describe outline process models for requirements engineering, software development, testing and evolution • To explain the Rational Unified Process model • To introduce CASE technology to support software process activities

  3. Topics covered • Software process models • Process iteration • Process activities • The Rational Unified Process • Computer-aided software engineering Today I will suppress most of the slides we examine and focus on only a few critical points. Use the entire set of slides as a study guide and aid to review.

  4. The software process • A structured set of activities required to develop a software system • Specification; • Design; • Validation; • Evolution. • A software process model is an abstract representation of a process. It presents a description of a process from some particular perspective.

  5. Generic software process models • The waterfall model • Separate and distinct phases of specification and development. • Evolutionary development • Specification, development and validation are interleaved. • Component-based software engineering • The system is assembled from existing components. • There are many variants of these models e.g. formal development where a waterfall-like process is used but the specification is a formal specification that is refined through several stages to an implementable design.

  6. Waterfall model

  7. Evolutionary development

  8. Reuse-oriented development

  9. Incremental development

  10. Spiral model of software process

  11. The requirements engineering process

  12. The software design process

  13. The debugging process

  14. The testing process

  15. Testing phases

  16. System evolution

  17. RUP phase model

  18. Computer-aided software engineering • Computer-aided software engineering (CASE) is software to support software development and evolution processes. • Activity automation • Graphical editors for system model development; • Data dictionary to manage design entities; • Graphical UI builder for user interface construction; • Debuggers to support program fault finding; • Automated translators to generate new versions of a program.

  19. Functional tool classification

  20. Activity-based tool classification

  21. Tools, workbenches, environments

  22. Homework • Required: • By Wednesday 15 Sep 2004 • Submit written responses to these questions: • 4.1 (8 pts) • 4.5 (4 pts) • 4.6 (5 pts) • Optional: • By Wednesday 22 Sep 2004 • Answer any or all of questions 4.2, 4,3, 4.4 or 4.8 for 2 pts each.

  23. DISCUSSION

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