Organisation of the program

Every program must be divided into the following program parts  

Care must be taken to ensure that individual program units should be able to run within the framework of other programs and other data processing systems. 

Machine and operating system dependent features must be concentrated in specific identified subroutines and functions 

Each program unit must document itself by structure program design. 

All statements within one block must be indented and optical emphasis of diverse logic through indentations and paragraphs must be given. 

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In the present organisation of the programs, the above tasks require the cumbersome rewriting of parameter lists and small but important changes in the different routines. Such processes are error prone and are better avoided. 

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