Since the cause and effect relationship between input and output of a system exists, we can define transfer function of the system mathematically which generally characterizes the input-output relationship of the system also. We can represent a system by its mathematical modelling. Therefore, it is possible to represent a system by mathematical equations. Block diagram and signal flow graph are useful to represent the system completely. Using the block diagram reduction technique or Mason’s gain formula in signal flow graph, we can get the overall transfer function of the system very easily. The aim of this chapter is to discuss the following:

- Transfer function of the system,
- block diagram representation,
- signal flow graph, ...

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