1. Maintenance

2. Review: Types of Maintenance
Corrective
bug fixes, security fixes, etc
Adaptive
new hardware, new OS, …
Perfective
adding new functions
Preventative
Y2K

3. Where the money goes Rest of Project Corrective Adaptive Functional
33%
Rest of Project
40%
Corrective
Adaptive
Functional
15%
12%
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4. The big questions… Why does so much money go into maintenance?
How do we reduce the maintenance costs?

5. Quality of the software being maintained
Foundation One: Package Quality
Foundation Two: Maintenance Policy
test section 11.2

6. Does software wear out?
errors
per KSLOC
Time

7. Does software wear out? errors per KSLOC Time Expected
Actual - due to Maintenance
Effective

8. Essential SQA Maintenance Tasks
Maintain Accurate Design document
Maintain Coding Standards
conduct formal code reviews
set testing guidelines via a Maintenance Test Plan
Track Quality Metrics
mean time to correct errors
mean time to add new function
root causes of errors …