Auxiliary function

The auxiliary function is one of the three types of functions (alongside basic and additional) that can be performed by components of an engineeiring system that is a device.

As a function directed at a system component, it has the lowest rank in function ranking (usually 1 point). This is because the ranking approach assumes that the main emphasis is placed on interactions between the system and components of its supersystem. How well the functions inside the system are performed is of least importance.