Software Evolution Notes

Software Development & Evolution Spiral Model

Software Maintenance Cost

• Team Stability
• Poor Development Practice
• Staff Skills
• Program Age & Structure

Maintenance Environment Assessment:

• The number and complexity of system interfaces
• The number of inherently volatile system requirements
• The business processes in which the system is used

Maintainability Metrics:

• Number of requests for collective maintenance
• Average time required for impact analysis
• Average time taken to implement a change request
• Number of outstanding change requests

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