Section 1000.87 - How does the AFA specify the services provided, functions performed, and responsibilities assumed by the Tribe/Consortium and those retained by the Secretary?(a) The AFA must specify in writing the services, functions, and responsibilities to be assumed by the Tribe/Consortium and the functions, services, and responsibilities to be retained by the Secretary.(b) Any division of responsibilities between the Tribe/Consortium and BIA should be clearly stated in writing as part of the AFA. Similarly, when there is a relationship between the program and BIA's residual responsibility, the relationship should be in writing.