You can choose from two approaches to determine the cause of problems in program behavior of your application: source-language debugging or interactive debugging.
For source-language debugging, COBOL provides several language elements, compiler options, and listing outputs that make debugging easier.
For interactive debugging, you can use the Debug Perspective of Rational Developer for System z, the graphical debugging interface.
related tasks
Debugging with source language
Debugging using compiler options
Using the debugger
Getting listings
Debugging user exits
Debugging assembler routines