IS301 – Software Engineering mailto:mkabay@norwich.edu V: 802.479.7937 Software Processes IS301 – Software Engineering Lecture # 4 – 2004-09-08 M. E. Kabay, PhD, CISSP Assoc. Prof. Information Assurance Division of Business & Management, Norwich University mailto:mkabay@norwich.edu V: 802.479.7937 M. E. Kabay, PhD, CISSP Copyright © 2003 M. E. Kabay. All rights reserved.

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

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.

Copyright © 2003 M. E. Kabay. All rights reserved. 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. Copyright © 2003 M. E. Kabay. All rights reserved.

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. Copyright © 2003 M. E. Kabay. All rights reserved.

Copyright © 2003 M. E. Kabay. All rights reserved. Waterfall model Copyright © 2003 M. E. Kabay. All rights reserved.

Evolutionary development

Reuse-oriented development

Incremental development

Spiral model of software process Copyright © 2003 M. E. Kabay. All rights reserved.

The requirements engineering process

The software design process

The debugging process

The testing process

Testing phases

System evolution

RUP phase model

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.

Functional tool classification Copyright © 2003 M. E. Kabay. All rights reserved.

Activity-based tool classification

Tools, workbenches, environments

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.

Copyright © 2003 M. E. Kabay. All rights reserved. DISCUSSION Copyright © 2003 M. E. Kabay. All rights reserved.