" Most DID patients are rather muted compared to those cases incorrectly assumed to epitomize the condition (Kluft, 1985b). The personalities enact adaptational patterns and strategies that developed in the service of defense and survival. Once this pattern, which disposes of upsetting material and pressures rapidly and efficiently, is established, it may be repeated again and again to cope with both further overwhelming experiences and more mundane developmental and adaptational issues.
Once the DID that developed in order to cope with intolerable childhood circumstances has achieved some degree of secondary autonomy, it becomes increasingly maladaptive. "

― , Handbook of Dissociation: Theoretical, Empirical, and Clinical Perspectives