I'm in the process of breaking down a huge RPG program into ILE RPG. I need to break the whole program into modules so we can make changes to one module only and then promote the changed module to production. What areas do I need to concentrate on in terms of making the program modules independent of each other? Can I have a specification wise (F,D,C,O) listing as to what needs to be changed in the main program?

If you're breaking the program down and using procedures, only "D" and "C" specs can be used in the procedures. I would suggest you take business logic calculations and put them in independent modules or bound programs. With Bound programs, you can have common file usage in the bound programs and modules to process the business logic in each area.

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This was first published in August 2003

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