This conceptual model represents BIM Fields, the first dimension of the Tri-axial Model. BIM Fields refer to all topics, activities, and actors across the BIM domain. The Venn diagram (three overlapping circles) identifies Field Types (Technology, Process and Policy), Field Components (Players, Deliverables and Requirements), Field interactions and Field overlaps.
The model was first referred to as ‘three interlocking knowledge nodes’ in Paper A1 "A Proposed Framework". The term ‘nodes’ was later replaced with ‘fields’ to match the notion of ‘players’.
Below is a short video briefly explaining the above on the dedicated BIM Framework YouTube channel: