The OSS is the functional entity from which the network operator monitors and controls the system.

The objects generated in these systems are the functional entities with the following features:

The enormous flexibility of the systems approach has its penalties in potential confusion due to the highly variable relationship between functional and physical entities.

As a whole, the foot is a functional entity.

Tectology as a constructive science built elements into a functional entity using general laws of organization.

A living, functional entity, changing and evolving all the time.

It is essentially a functional entity, which may influence biomechanical and neural integrity.

Physical interfaces would be handled in the same manner, with the physical entities on the diagonal rather than the functional entities.

Sabotage in a genetic-engineering project would not result in a healthy, functional entity.

In medicine, a deficiency is a lack or shortage of a functional entity, by less than normal or necessary supply or function.