Business process capture is a first step in the larger endeavour of business process management. In this paper we view business process capture as a knowledge conversion process. We explore the conversion of knowledge when business analysts capture information about business processes from domain experts. We identify seven process capture activities in a thematic analysis of comments made by business analysts in response to open-ended questions in an online survey. The seven activities are involving, simplifying, tailoring, training, combining, confirming, and engaging soft skills. We show how these activities involve the transfer of tacit and explicit knowledge between the business analyst and the domain expert and how the transfer conforms to the SECI modes of knowledge conversion, well known in the research domain of knowledge management. The paper contributes a SECI-based knowledge conversion model of business process capture and insight for business analysts about business process capture activities.