Important concepts regarding the transfer function of a system are defined and described in DIN 19 226 and DIN 19 229. As the transfer function of the individual system variables as a function of the time is allocated to another, it describes the dynamic systems, generally mathematically. How these systems react to this is shown in the dynamic behaviour.
If certain requirements are fulfilled in a system with given input variables u and output variables v and all input variables are uniquely allocated to the output variables, this unique allocation is known as the transfer function of the system.