A sequence of qualified, effective Heads who stay six years or more—with a series of orderly transitions—is the best-case scenario for any private-independent school. However, in given situations, a temporary replacement can be necessary, appropriate, and advantageous. In the most common circumstance, the school faces a vacancy relatively late in the school year, leaving insufficient time to conduct a careful search for a permanent Head. In other instances, the Board may have conducted a Head search without reaching a clear decision or identifying a need for a hiatus between permanent Heads. Perhaps the Board has decided to postpone an all-out search to test the qualities of an administrator already at the school.