Abstract: The paper reviews, as a case history, the progress (to 1980) of the development of a Nursing Manpower Plan for Wellington Hospital Board.The main features of protocol are delineated.The prime requirement for the development of a manpower plan are perceived of as having available, reliable, quantifiable and comparable data.Discussion indicates the methods of collection, analysis and use (actual and potential) of quantifiable data.The use of quantifiable data indicated the potential, for the use of “nursing hours per patient per day”