The Language Environment IBM-supplied default runtime option settings might not provide the same runtime behavior as the OS/VS COBOL or VS COBOL II runtime options. Because there are differences, this section has two purposes. First, to inform you of the recommended runtime option settings for COBOL programs, so that you can determine which runtime options settings you need to change. Second, to ensure that you do not inadvertently change any default settings that are highly recommended for COBOL programs.