Every public organisation faces the challenge of improving productivity. In this effort, productivity measures are essential managerial tools. However, the task of measuring service productivity has proven to be challenging. A key reason for the challenges seems to be related to the intangibility of services. The objective of this paper is to identify and apply a productivity measurement method satisfying the information requirements of public managers. The study is carried out using a qualitative case study approach. The paper consists of two parts: first, the current knowledge of the issue is examined by reviewing the literature on (service) productivity and performance measurement; second, an action research is carried out in the context of four case services of the City of Helsinki, Finland. A disaggregated approach to productivity measurement is applied. Three different measurement frameworks and methods are evaluated in light of practical criteria for measurement. Finally, a matrix method is chosen and applied in practice. As a result the paper provides more understanding of the process of applying the disaggregated productivity measurement approach in the context of public welfare services.