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Contents Introduction Requirements Engineering Project Management

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Presentation on theme: "Contents Introduction Requirements Engineering Project Management"— Presentation transcript:

1 Contents Introduction Requirements Engineering Project Management
Software Design Detailed Design and Coding Quality Assurance Software Maintenance PVK-HT05

2 Software Maintenance Process
The most expensive part of the software lifecycle! Require- ments Change Request Impact Analysis Release Planning Change Design Implementation Test Release Change PVK-HT05

3 Ian Sommerville 1995  Software Engineering, 5th edition.

4 Types of Maintenance Corrective: Focuses on fixing defects
Adaptive: Includes all changes to meet the evolving needs of the user and the environment Perfective: perfecting existing functions Preventive: Preventing system performance from degrading to unacceptable levels PVK-HT05

5 Use of Maintenance Time
*See [Schach 97]. **See [Somm 96]. ***See [Pfleeger 98]. PVK-HT05

6 Maintenance Metrics Control complexity Data complexity
Length of identifier names Program comments Coupling Cohesion Degree of user interaction PVK-HT05

7 Configuration Management
New versions of software systems are created as they change For different machines/OS Offering different functionality Tailored for particular user requirements Configuration management is concerned with managing evolving software systems System change is a team activity CM aims to control the costs and effort involved in making changes to a system PVK-HT05

8 Version and Release Management
Invent identification scheme for system versions Plan when new system version is to be produced Ensure that version management procedures and tools are properly applied Plan and distribute new system releases PVK-HT05

9 Storing Versions Naive: Separate files for each version
Version handling by numbering schemes Double Maintenance Problem Solution: One original version plus deltas Shared Data Problem Simultaneous Update Problem Solution: Check-in/check-out mechanism Still a problem: Merging versions PVK-HT05

10 Tools for Version and Configuration Control
General: History- and log-files Hierarchical file systems ... Version Control: Modification tracking Control of development branches Efficient storage and retrieval Access control Merging versions SCCS, RCS, CVS, ... File comparators Patch generators Configuration control: Dependency management and control System creation Integration with version control ... Make, makefile generators, ... PVK-HT05

11 Software Rejuvenation
Redocumentation: static analysis adds more information Restructuring: transform to improve code structure Reverse engineering: recreate design and specification information from the code Reengineering: reverse engineer and then make changes to specification and design to complete the logical model; then generate new system from revised specification and design PVK-HT05


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