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RPG programming on IBM i explained one program at a time, from file specifications and copy members to a plain-English description of every program.

Make the refactor vs rewrite choice one RPG program at a time. See the signals that point each program to free-format RPG on IBM i or to a new language.

See what IT general controls ask of each RPG program change on IBM i, and how an impact list and plain-English program descriptions build the change record.

Legacy system modernization on IBM i starts from your RPG source. See what to count before you pick a path and how readiness sets the order of work.

Plan AS400 green screen modernization screen by screen. List each display file with the RPG programs behind it, and choose what changes on each screen.