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Understanding Software Maintenance Challenges

Explore key issues in software maintenance, including reverse engineering, cost distribution, and tools. Learn about different types of maintenance activities and common problems faced. Discover how to organize and optimize maintenance processes effectively.

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Understanding Software Maintenance Challenges

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  1. Software Maintenance Main issues: why maintenance is such an issue reverse engineering and its limitations how to organize maintenance

  2. Relative distribution of software/hardware costs 100 Hardware Development 60 Percent of total cost Software 20 Maintenance 1955 1970 1985 Year

  3. The process of modifying a software system or component after delivery to correct faults, improve performance or other attributes, or adapt to a changed environment Software Maintenance, definition

  4. Maintenance is thus concerned with: • correcting errors found after the software has been delivered • adapting the software to changing requirements, changing environments, ...

  5. Kinds of maintenance activities • corrective maintenance: correcting errors • adaptive maintenance: adapting to changes in the environment (both hardware and software) • perfective maintenance: adapting to changing user requirements • preventive maintenance: increasing the system’s maintainability

  6. Distribution of maintenance activities corrective 21% perfective 50% adaptive 25% preventive 4%

  7. Unstructured code Insufficient domain knowledge Insufficient documentation Major causes of maintenance problems

  8. Restructuring • Functionality does not change • From one representation to another, at the same level of abstraction, such as: • From spaghetti code to structured code • Refactoring after a design step in agile approaches • Black box restructuring: add a wrapper • With platform change: migration

  9. Software maintenance tools • Tools to ease perceptual processes (reformatters) • Tools to gain insight in static structure • Tools to gain insight in dynamic behavior • Tools that inspect version history

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