I have been studying the fascinating material of Ralph B. Allison, MD who wrote, “Minds In Many Pieces: Revealing The Spiritual Side of Multiple Personality Disorder,” and whose website is found here:
He makes a distinction between MPD and DID which was lumped together some years back in the DSM (Diagnostic and Statistical Manual of Mental Disorders) which I find most interesting. There are so many articles to read at his website!
How MPD and DID form:
“MPD and DID are Two Different Post-Traumatic Disorders”