The Belbin Team Inventory is a behavioural test, also called the Belbin Self-Perception Inventory, Belbin Team Role Inventory, BSPI or BTRI. It was devised by Meredith Belbin to measure preference for nine Team Roles; he had identified eight of these whilst studying numerous teams at Henley Management College. The Belbin Team Inventory is a behavioural test, also called the Belbin Self-Perception Inventory, Belbin Team Role Inventory, BSPI or BTRI. It was devised by Meredith Belbin to measure preference for nine Team Roles; he had identified eight of these whilst studying numerous teams at Henley Management College.