An initial phase for uncovering and "mapping" the patient's alters
A phase of treating the traumatic memories and "fusing" the alters
And a phase of consolidating the patient's newly integrated personality
Most therapists who treat multiples, or DID patients, recommend further treatment after personality integration, on the grounds that the patient has not learned the social skills that most people acquire in adolescence and early adult life.
I feel that with my last therapist we worked through initial phase (it took 3 years due to trust issues). WIth my current therapist we're in the treating memories stage. It gives us an indication of what we can expect to come which is insightful and thought it may interest others too.