Hypothetical question (yes, really hypothetical): At what point do you decide to re-write a program rather than fix it? And, if the decision is to re-write it, how do you justify the decision to TPTB?

Consider the following ... you have a program that's about 15 years old. Written in RPG III, converted to ILE using CVTRPGSRC but never updated to take advantage of ILE capabilities, and it's a total mess (by fairly modern standards). Continued modification to the program just seems to make it worse. The program is not small ... and fairly key to the system you are working on.

How can you justify a re-write? How can you quantify the cost / benefit ratio to show that a re-write would be in the best interests of continued development?


p.s. and, just in case someone from my employer is reading this message, this is truly a hypothetical situation ... although we do have some pretty old code.

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