modifying/refactoring existing code is a lot of efforts . That may be true, but do you have to? Propose this as a way forward. Like choroba mentioned Re: Convincing management for OO having a good set of modules makes future tasks easier. You may be able to just start doing it Find the common parts of a whole bunch of prior art and make some real good reusable modules. Use them in the next project. Then projects after that too. If prior art needs to fixed refactor/rewrite then.