This paper reflects Gulick’s notes on the theory of organization in the context of Public Sector Manager’s work milieu in Tanzania. Using the Performance Improvement Model (PIM) as the proxy the paper instantiates the POSDCORB by drawing the parallels between the POSDCORB mnemonic and PIM and therefore corroborates Gulick’s summation. We argue that in order to apply the classic theory of organization in today’s public administration an attempt should be made to view organization theory from a design perspective. The paper recommends that more research should be done to instantiate POSDCORB and contributes to the corpus knowledge of public administration discipline.