For the systematic evolution of interdisciplinary socio-technical systems, such as Business Intelligence (BI), artifacts are needed that comprehensively address multifaceted challenges. To support these strategic improvement initiatives, the authors proposed a BI Maturity Model (MM) in prior research. In this paper, they develop an approach to measure maturity of BI in organizations, thereby operationalizing their existing BI MM. In fact, a new maturity measurement instrument is developed that can be used in empirical research. According to the proposed approach, BI maturity can be calculated on the basis of 25 items and organizations are classified into five maturity levels. An exemplary application, using data from 92 organizations, shows that most organizations reside on maturity level three.