What is Modularization in SAP ABAP Programming? The concept of modularization is divided the main program into sub-programs for better readability and re-usability. Modularization can be implemented in the following ways: Include Programs. Function Modules. Sub-routines. Classes. Include Programs: These programs can not be executed directly. These are sub-programs which contains a set of re-usable statements. These programs doesn't contain parameter interface, that is no importing and exporting parameter. Function Module: These are also sub-programs which contains a set of reusable statements for better readability and re-usability. Function modules contains parameter interface, that is importing and exporting parameter. These function module can be executed independently. Function modules contains exception to catch certain type of error.] For functional modules T-code is : SE37. Sub-routines in SAP ABAP: Sub-routines are sub-programs in SAP ABAP ...