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Modules

As discussed in lesson 1 - Introduction to Systems, a large system actually consists of various small independent subsystems that combine together to build up the large systems. While designing the system too, the complete system is divided into small independent modules which may further be divided if the need be. Such independent modules are designed and coded separately and are later combined together to make the system functional.

For the better understanding and design of the system, it should be made as a hierarchy of modules. Lower level modules are generally smaller in scope and size compared to higher level modules and serve to partition processes into separate functions. Following factors should be considered while working on modules:

Size:

The number of instructions contained in a module should be limited so that module size is generally small.

Shared use:

Functions should not be duplicated in separate modules, but established in a single module that can be invoked by any other module when needed.

Other Design Elements

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