At least there are two reasons for inadequacy of this type of service sector productivity measures. The first reason is the fact that input and output of service sector productivity consist not only of quantitative elements but also qualitative (Reid, 2005). The second reason is the fact that quality and productivity in all the sectors of service are strongly correlative (Gummesson, 1992). Customer involvement to the organizational activity in the service sector generates many output quality variations. Therefore, output of service sector in many cases could be measured only by measuring its quality variations. How can service sector productivity be determined? What parameters are primary in the determination of service sector productivity? How are these parameters related? What are the singularities in the determination of service sector productivity?These topics illustrate the core of the research problem