Public sector reforms regularly include a performance measurement dimension (Pollitt and Bouckaert, 2004). In doing so, performance measurement and the supply of performance information are taken for granted. Availability of performance measurement -the fundament of most New Public Management (NPM) reforms -is assumed, and reforms are built on this unsteady foundation. How realistic is this? In fact, performance measurement is a complex process that requires attention in its own right. A performance measurement policy is needed before a performance management policy may be set up.A good insight in the organisational characteristics that foster performance measurement is crucial in order to set up a performance measurement policy. Therefore, a theory of the factors that make organisations measure is needed. In this study, performance measurement is the dependent variable. Six hypotheses on why organisations measure are tested, based on a survey within the Ministry of the Flemish Community, Belgium. Organisational characteristics are related to the adoption and implementation of performance measurement.The article is structured along the variables and the hypotheses. Most of the theory therefore, is embedded in the discussion of the hypotheses. The first paragraph is a description of performance measurement. Performance measurement is a fuzzy concept, with different people adhering substantially different meanings to it. This section shows how the subject is dealt with in this article. Next, we shortly describe the methodology of the survey. Thirdly, the dependent variables are presented. The dependent variables are performance measurement adoption and performance measurement implementation. Fourthly, by bringing in the independent variables six hypotheses may be put. Finally, there is a conclusion with some implications for practice and theory.