By entering RUN STEP or GO STEP, you can run a program in STEP mode. When Business Rules is in STEP mode, "STEP" will be displayed in the bottom left corner of the screen. "INPUT" will be displayed at the points in the program where input is required. The line number field will contain the number of the program line to be executed next. In release 4.3 and later, stepping through a program will also display each program source statement just before executing it.
STEP mode allows debugging in that the program is run one line at a time, moving forward when you press ENTER. Meanwhile, variables can be tested.