CSSE375-03-framework.ppt
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The document discusses a software maintenance framework that consists of six components: 1) User requirements such as requests for new features or bug fixes. 2) The organizational environment including changes in policies or competition. 3) The operational environment like new hardware, software, or platforms. 4) The maintenance process including capturing requirements, prioritizing requests, and error detection. 5) The software product itself in terms of complexity, documentation, and quality issues over time. 6) Maintenance personnel and issues around turnover, expertise, and working practices.
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- 1. Maintenance Framework Steve Chenoweth CSSE 375, Rose-Hulman Based on Don Bagerts 2006 Lecture Ref M 2
- 2. 2 Today Turn in last Fridays quiz, if not already Any Q on one minute talk for Thurs (& turn-in on Angel Wed night)? Finish off yesterdays stuff Intro to Maint & Constr Todays topic this Maybe just a start on Thursdays topic Software Change
- 3. 3 Definition A framework is a set of ideas, conditions or assumptions that determines how something will be approached, perceived on understood
- 4. Discussion: Who and what need to be involved in software maintenance?
- 5. 5 Software Maintenance Framework Components User Requirements Organizational Environment Operational Environment Maintenance Process Software Product Maintenance Personnel
- 6. 6 User Requirements Requests for additional features Usually Wait for next release Specials for key customers or submarkets Correction of defects (bugs) Fix now Wait for next release Other support (e.g. training, help desk) Should developers take a turn at the help desk?
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- 8. 8 Operational Environment New Platform Hardware Operating System Third Party Software Nasty scenario One of the components you use forces you to do an expensive upgrade Nastier That upgrade wont work with other components you have to use
- 9. 9 Maintenance Process Capturing requirements / maintenance requests Investigating and prioritizing those requests Creativity and undocumented assumptions Variation in programming practice Coding and documentation standards Paradigm shift Programs with old structures that are now indecipherable Dead paradigms for living systems Legacy code issues Fixed Point Theorem for Info Systems Error detection and correction Finding the root cause of software errors growing cost as the system is developed and used!
- 10. 10 Maintenance Process - Error detection and correction
- 11. 11 Software Product Application domain issues domains mature Documentation quality causes support issues Code flexibility No clear standards for code changes (vs the rest of engineering) Code complexity keeps getting worse Program structure ditto, unless refactored Product quality kinda like entropy
- 12. 12 Maintenance Personnel Staff Turnover A total killer of maintenance capability Which often means, key people can never leave! Application Domain Expertise A critical intellectual property Working Practices The attitude thing. A long-term focus is required of the people
- 13. Discussion: What relations and interactions with the product are the most important in maintenance?