The protocol requires various steps to be taken 'immediately' or 'without delay'.

A distance-vector routing protocol requires that a router informs its neighbors of topology changes periodically.

This protocol requires that three sequential events must be completed prior to surgical incision in order to reduce iatrogenic errors and postoperative complications.

The protocol requires setting up of a regulatory body.

For greater precision, or where style or protocol requires it, unit of less than a foot may be described.