Efficiency has long been the primary concern in the study of public administration. Suffice it to say that most efforts from Wilson to at least Simon were directed toward the pursuit and debate of efficiency. Questions that were raised concerning efficiency are still with us. Indeed. the problems are more knotty. the issues more complex. We have developed other idioms with which to analyze, discuss, and decide; thus ”cost-benefit” and ”cost-effective”. But what are touted as tools that will enable us to solve our problems and resolve our disputes demonstrate in use that - though they may have a certain usefulness - they neither cut Gordian knots nor serve as philosophers' stones (Waldo, 1984: Iii). The purpose of this paper is to clarify the concept of efficiency in public administration through comparison. I begin with Wilson's perspective, then Gulick, Taylor, Dahl, Simon. Waldo followed. Finally, I explore the applicability of business's criteria of efficiency as they are employed in the public Agencies by making distinction in between.