ABSTRACT
This chapter describes different ways to measure flow. First, declarative measures are introduced, beginning with the interview method, which was the very first approach to assess flow. However, along with interviews, Csikszentmihalyi already started to develop short questionnaires that captured flow. Hence, second, the chapter presents questionnaires assessing (a) primarily demand-skill balance, (b) selected components and/or additional components of flow, and (c) most/all components of flow. It also outlines the non-declarative measurement techniques such as neural and psychophysiological measures. Flow is a state "in which people are so intensely involved in an activity that nothing else seems to matter; the experience itself is so enjoyable that people will do it even at great cost, for the sheer sake of doing it". Csikszentmihalyi found characteristics that were shared by the different activities and thus started to describe the common experience as the experience of the flow.
