IfSQ
85% of errors can be fixed in a few hours
Research Finding:
About 85% of errors can be fixed in a few hours if caught in the development stage.
Sources:

- David M. Weiss
- Recorded 1979 in Journal of Systems and Software, 1, no. 2, June
- Pages 57-70

- Thomas J. Ostrand, and Elaine J. Weyuker
- Recorded 1984 in Journal of Systems and Software, 4, no. 4, November
- Pages 289-300

- Robert B. Grady, and Tom Van Slack
- Published 1992 by Prentice Hall