Symbolic debugging does not allow you to view the program source, but does allow you to reference paragraphs and variables by their COBOL identifiers. The advantage to using symbolic debugging rather than source debugging is that the compiled object module is much smaller. This may be useful if disk space is very tight. Some application developers compile their programs with symbolic debugging for delivery to clients in order to facilitate the resolution of client questions over the phone. You must compile the program with the -Gy or -Gs option to use symbolic debugging.