As a discipline, practical knowledge is relatively new. Over recent years it has emerged and grown, but there are still only in two places internationally where you can explicitly study it (Nord University in Norway and Södertörn University in Sweden). On the other hand, the main questions of practical knowledge, as they relate to knowledge, are age old philosophical questions, while other questions dealt with implicate other disciplines (cognitive science, pedagogy, work-life research, etc.). As such, practical knowledge is interdisciplinary and should perhaps be considered a set of questions rather than a discipline. But if it can be considered a discipline, then it needs a principle of unity. Perhaps this is the lived exercise of practice and joint philosophical reflection. In the proposed chapter, this is fleshed out in terms of consideration of (a) who the students and researchers of practical knowledge are – what is it that motivates them to study (participant and field plurality)? (b) what are the key resources of practical knowledge that can allow us to ask these questions (disciplinary plurality) and how is practical knowledge related to philosophy as a discipline? (c) what are the spaces of the study of practical knowledge, what happens here and what is the potential for development? Based on this analysis, we will develop a core idea of practical knowledge as a unity that is based on plurality and put in in a framework of a contemporary debate on the relation between science and lived experience as well as philosophy and practice.