One Company's Code Modernization Process at eServer magazine is a case study of the modernisation of a legacy iSeries application.

"We had a well-structured RPG program model that we’ve reused over and over again, so we knew how to tell user-interface subroutines from business- and editing-rule subroutines," Daniels explains. Sigh. Most of us don't have this, so we need RPG refactoring tools, about which I have ranted before.