Manageral aspects of software maintance
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The document defines software maintenance and categorizes it. Software maintenance involves changes to software away from the previous implementation, rather than just restoring it to its original state. There are three main types of maintenance: corrective, adaptive, and perfective. Software maintenance can also be abstracted into two broad categories: corrective and enhancement. Corrective maintenance leaves functional specifications unchanged, while enhancement maintenance changes original specifications but leaves primary functions intact. The document notes that correcting bugs is a small part of actual maintenance effort, and that successful maintenance depends on gaining an understanding of the software system through reviewing code, documentation, and user requests.
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- 1. MANAGERAL ASPECTS OF SOFTWARE MAINTANCE M.SandhiyaM.SC(IT) Department of CS&IT Nadar Saraswathi College of Arts Science Theni
- 2. SOFTWARE MAINTENANCE DEFINED Software may be defined as "a realization of a of plans or specifications, encoded in computer language."Software is not a physical entity, it is an abstraction, a logical representation that is physically manifested in the form of program listings and documentation. Software, unlike hardware, does not wear out. Hardware is subject to deterioration in the course operation and requires maintenance in order to restore it to its former operating condition. Software, on the other hand, not change unless and until people change it. Software does not wear out of its own accord. Software maintenance does not mean restoring software to its former state,rather it involves changes away from the previous implementation.
- 3. TYPE OF MAINTANACE • 1.Corrective maintenance: Emergency program fixes and routine debugging. • 2. Adaptive: The accommodation of changes to data inputs and fields, and to hardware and software. • 3. Perfective maintenance: Enhancements for users, improvements program documentation, and recoding for efficiency in computation.
- 4. software maintenance abstracted into two broad categories: • Corrective: Corrective maintenance may be characterized as modifications that leave the functional specifications of the system unchanged. Such maintenance is necessary and mandatory, in the sense that the system cannot operate or existing specifications cannot be met. This would include corrective and adaptive maintenance categories of Lientz and Swanson and RADC, and categories 3 through 6 from the GAO study. • Enhancement: Enhancement maintenance changes the original functional specifications of the system but leaves the primary functions intact. That is to say, an enhancement may add a report that was not called for in the original specifications but which is now required by a user due to changed government
- 5. SOFTWARE MAIHTENABCE ACTIVITIES • A popular misconception about software maintenance, one reinforced by the use of the terra "maintenance", is that the primary activity is the correction of "bugs". The three studies discussed earlier revealed that correcting bugs is a small part of the actual maintenance effort the distribution of software maintenance activities in the organizations studied in Successful software maintenance depends upon gaining a level of understanding of the software system. Software cannot be maintained unless those responsible for maintenance understand the software. Maintenance personnel spend at least half of their time trying to - the system code, the system documentation, and the requests from the users.