Software maintenance starts from day one of a project and inspected software is less expensive to alter, fix and maintain.
Research has yielded these findings:
- The average project experiences about a 25 percent change in requirements during development.
- 70 to 85 percent of rework on a typical project is caused by changes in requirements during development.
- Raytheon reduced its cost of rework from about 40% of total project cost to 20% through an initiative that focused on inspections.