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External system services,
1. Source program structure and language fundamentals
2. Data items, structures and records,
3. Statements for program control flow,
4. Statements for I/O handling via keyboard, screen and command line,
5. Statements for file handling +
sorting of files,
6. Statements for standard arithmetic,
7. Statements for data manipulation in memory +
character-strings handling,
8. Statements for subscripting and table handling,
9. Statements for modular and OO structure of project,
10. Statements of report-writer for level-controlled listings,
Internal callable services +
MX COBOL library routines