in reply to How to retain perl in-house code
From a business point of view, rewriting working code (without changing its function) doesn't make sense: you are spending lots of time and money without improving the user experience. Indeed, the user experience may get a lot worse if you introduce new bugs in the rewrite. After all, the user doesn't usually care what language a product is written in. Would this time and money be better spent in adding new customer-requested features? You might point them at On Not Rewriting by Joel Spolsky.