The aim of this chapter is to illustrate and model the construction of a measurement tool for entrepreneurship education where the tool itself is aimed at Finnish teachers working in basic and secondary education. This study represents participatory action research as the research context has been facilitated and provided by the researchers, and the study objects initiate, respond, and develop their activities, thereby further reforming the context. The case reported here is the creation of a Measurement Tool for Entrepreneurship Education accomplished on an ESF-funded project. In this study we present multi-method, multi-investigator, multiple data and multiple theory triangulation settings. The phases of the measurement tool construction were identified from the data. Our aim is to present the process in order to link the theory and practice of entrepreneurship education. Here, a broad and multilayered definition of entrepreneurship education is utilized and, by making these aspects explicit, the tool has a role not only as a teacher’s self-evaluation kit but also as a steering system for developing schools and regions on a larger scale.