Self-tracking, or the desire to quantify one’s own behaviour by means of personal information systems, has developed from a niche activity for early adopters to a mass phenomenon. Despite its increasing spread in society, however, little is known about the drivers of technology adoption and use in this specific domain. Addressing this gap, the research-in-progress at hand aims to (1) theorize on the role of self-tracking attitudes – defined as specific consumer attitudes in the self-tracking context, and (2) present a research plan with the goal of developing a self-report scale capable to measure selftracking attitudes. We present the results of a first literature review and of 24 explorative expert interviews conducted to identify relevant cognitive, affective and conative concepts related to self-tracking attitudes. The results constitute a first step to develop a measurement scale that aims to contribute to adoption research and the development of successful self-tracking systems.