Re-engineering in Some Companies
The business progress usually constantly changes. Therefore, business requirement for a system also change. One common trigger for a re-engineering project is a new or revised business requirement. Given the requirement but we should learn about it clearly. Then the requirement analysis phase must be revisited with a focus on impact of the new requirement on the existing system. Based on requirements analysis, the project would then proceed to the decision analysis, design, construction and implementation phases. We should meet all the requirements before re-engineering project has been run. That is the absolute requirements which we should meet before everything gone away.
We have noticed that the maintenance and re-engineering projects initiate in different phases of the basic methodology. You might be concerned that repeating these phases would require excessive time and effort. For that problem we should keep in mind, however, that the scope of maintenance and re-engineering project is much smaller than the original project that created the operational system. Thus, the work required in each case phase is much less than you have might expected. Designing and re-engineering project is going to be trend especially in the middle of the uncertainty because of the economical crisis which has been happened to us right now.