Larger organisation have multiple interaction mechanism with the outside world. Various departments, functions, teams have all kinds of relationships with various customers, suppliers, audiences, agents etc.
These could be modeled in a matrix of interaction. In this way designers of organizations can order and analyse the context, the needs and characteristics of the interaction based border.
Whether this approach catches the all aspects, especially the emotional and subjective parts of the border experiences, is questionable, but it could provide useful insight and act as an aid to manage the activities at the border.