Some people are born vulnerable to developing borderline personality disorder. This may happen when a person who has difficulty controlling their emotions experiences a social environment that is not equipped to meet their unique needs. This program, the second in a series of five on Borderline Personality Disorder, explains the delicate interplay of a person’s inborn personality and their social environment. From the homes of families coping with BPD to research labs using brain imaging technology, the various factors that can lead to the development of BPD are explored.