Maintenance Phase

Software Evolution

- The process of developing software initially, then timely updating it for various reasons

Purpose: 1) Add more features or to remove absolute functionalities

               2) New requirements and the environment changed

               3) Improve the performance or reliability of the system

Five stages

Stages	Explanation
Change requests	- Urgent changes may have to be implemented without going through all stages of the software engineering process
Impact Analysis	- A formal way of collecting data and supposition in support of the pros and cons in any change or disruption to your system
Release planning	- Fault repair - Platform Adaptation - System enhancement
Change Implementation	- Proposed changes - Requirements analysis - Requirement updating (if requirements are accepted) - Software development
System Release	- Release the system and move to maintenance stage

Maintenance

- Provide ongoing assistance for an information system and its users after system is implemented

Objective

- Correct errors or faults or problems in the system

- Improve system performance

- Adapt the system to a changed environment

- Access system security to prevent future breakdowns

Types of maintenance

A) Corrective Maintenance

B) Perfective Maintenance

C) Preventive Maintenance

Main Activities

- Tracking modification requests and error reports

- Monitoring system performance and improving performance or increase capacity

- Upgrading hardware and system software

- Improve the security of the system

- Implementing changes

- Updating documentation to reflect changes

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