Interim Ministers have a specific skill set. They have a short-term goal of assisting a congregation with moving toward a settled minister. Interim Ministers are engaged as close to immediately after a settled minister leaves, necessitating a short timeline. For these reasons, the Interim is hired by the Board of Trustees of a given Congregation, and is not called by the Congregation. This is codified in the Unity Temple ByLaws, found here and is UUA Policy.