IFATCA Policy is:

Implementation of 4EP shall be encouraged by MAs, both through their ANSP(s) and their regulator(s).

An ATCO shall not be held liable for incidents or accidents resulting solely or in part from the non-implementation of the 4EP.

To ensure the highest level of safety, teamwork and communication, the 4EP has as its basic requirement two ATCOs working physically next to each other.