Perfective maintenance - Implements changes in existing or new requirements of user - Program Writing

Discussion

• Nirja Shah   -Posted on 19 Oct 15
  - Software maintenance in software engineering is the modification of a software product after delivery to correct faults, to improve performance or other attributes.
  
  - In the late 1970s, a famous and widely cited survey study by Lientz and Swanson, exposed the very high fraction of life-cycle costs that were being expended on maintenance.
  
  - They categorized maintenance activities into four classes:
  
  Adaptive
  – It modifies the system to cope with changes in the software environment (DBMS, OS)
  
  Perfective
  – It helps in implementing new or changed user requirements which concern functional enhancements to the software
  
  Corrective
  – It helps in diagnosing and fixing errors, possibly ones found by users
  
  Preventive
  – It helps in increasing software maintainability or reliability to prevent problems in the future

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