A large number of practical experiences that have come from various Productivity Measurement and Enhancement System ProMES projects are organized around what seem to be three essential questions that have to be answered when one aims at productivity improvement. The first question regards the essence of organizational effectiveness and how a group can effectively contribute to that. In other words, the What of productivity improvement. The second question refers to the group s motives to contribute to organizational effectiveness. In other words, the Why of productivity improvement, from the perspective of the employees. The last question deals with the task strategies a group should follow in order to actually improve. In other words, the ...