Engineering is a path going from a problem to a solution. Problem is identified, the solution is proposed, developed and delivered. This is engineering. Now the system is in use. After some time, we want to update due to any business requirement then we will re-engineer it. Reengineering is the modification of a software system that takes place to add new functionality, or to correct errors. Re-engineering' is a set of activities that are carried out to re-structure a legacy system to a new system with better functionality and conform to the hardware and software quality constraint. The purpose of engineering is to solve some real-life problems where the purpose of re-engineering is to reconstitute it in a new form to make it better.
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