This paper considers the personal epistemology of adventure sports coaches, the existence of the epistemological chain and its impact on professional judgment and decision-making. The epistemological chain's role and operationalization in other fields is considered, offering clues to how it may manifest itself in the adventure sports coach context. High-level adventure sports coaches were interviewed and an interpretive phenomenological analysis approach was adopted for the interview transcripts. Based on these data, we suggest that the epistemological chain provides the criteria by which adventure sports coaches measure the success of their coaching practice in the field and, further, that this epistemological chain also underpins the professional judgment and decision-making process.