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How can we create callable modules of program code within one ABAP/4 Program? A. By defining macros. B. By creating include programs in the library. What are subroutines? Subroutines are program modules which can be called from other ABAP/4 programs or within the same program. What are the types of Subroutines? A. Internal Subroutines: The source code of the internal subroutines will be in the same ABAP/4 program as the calling procedure (internal call). B. External Subroutines: The source code of the external subroutines will be in an ABAP/4 program other than the calling procedure. What are the different types of parameters? Formal parameters: Parameters which are defined during the definition of subroutine with the FORM statement. Actual parameters: Parameters which are specified during the call of a subroutine with the PERFORM statement. How can one distinguish between different kinds of parameters? A. Input parameters are used to pass data to subroutines. B. Output parameters are used to pass data from subroutines. What are the different methods of passing data? A. Calling by reference: During a subroutine call, only the address of the actual parameter is transferred to the formal parameters. The formal parameter has no memory of its own, and we work with the field of the calling program within the subroutine. If we change the formal parameter, the field contents in the calling program also change. B. Calling by value: During a subroutine call, the formal parameters are created as copies of the actual parameters. The formal parameters have memory of their own. Changes to the formal parameters have no effect on the actual parameters. C. Calling by value and result: During a subroutine call, the formal parameters are created as copies of the actual parameters. The formal parameters have their own memory space. Changes to the formal parameters are copied to the actual parameters at the end of the subroutine. The method by which internal tables are passed is By Reference. What is the difference between the function module and a normal ABAP/4 subroutine? In contrast to normal subroutines function modules have uniquely defined interface. Sub routines do not return values.