Software re-engineering involves reorganizing and modifying existing software systems to improve maintainability. It includes activities like reverse engineering, program restructuring, modularization, and data re-engineering. Reverse engineering analyzes software to understand its design and specification. Program restructuring improves structure by removing complex logic and simplifying conditions. Modularization groups related program parts together. Data re-engineering analyzes and reorganizes data structures and values to create a more managed data environment. The objective is to make systems easier to understand and maintain through these re-engineering processes.

8. Forward engineering and re-engineering

9. The re-engineering process

11. Re-engineering approaches

13. The program translation process

15. The reverse engineering process

18. Spaghetti logic

19. Structured control logic

20. Condition simplification -- Complex condition if not (A > B and (C < D or not ( E > F) ) )... -- Simplified condition if (A <= B and (C>= D or E > F)...

21. Automatic program restructuring

28. Approaches to data re-engineering

30. Data migration

32. Data value inconsistencies

34. The data re-engineering process