It's the functional model of leadership, developed by John Adair and adopted by the RAF as the basis of its basic leadership programmes (Officer, Senior and Junior NCO) many years ago.
Action Centered Leadership
He's written a number of simple, clear books on leadership that are worth reading, and re-reading, even by experienced leaders. In a world bent on over-complicating everything, I find Adair to be a beacon of common sense and experience in an area that has sprouted a plethora of bulsh1tters.
Sun.