All of us have these parts within us. Sometimes those parts build us up with positive affirmations. But some of them can be our harshest critics. Dr. Richard Schwartz says that the mind is naturally multiple, which is a good thing. But how are someone's parts differentiated from, say, multiple personality disorder?

Dr. Richard Schwartz is a systemic family therapist and an academic. Grounded in systems thinking, Dr. Schwartz developed Internal Family Systems (IFS) in response to clients' descriptions of various parts within themselves. Find out more about his work at ifs-institute.com.