Before revision: Change requests typically originate from one of five sources: (i) problem reports that identify bugs that must be fixed, which forms the most common source , (ii) system enhancement requests from users , (iii) events in the development of other systems , (iv) changes in underlying structure and or standards (e.g.
After revision: Change requests typically originate from one of five sources: problem reports that identify bugs that must be fixed, which forms the most common source system enhancement requests from users events in the development of other systems changes in underlying structure and or standards (e.g.