In 1969, Millon proposed 8 personality prototypes that could be conceptuali
zed at lower levels of severity than the level of the personality disorders
. These personalities were fit into a theoretical system that emphasized th
e strength of the interpersonal attachment and the mode of accommodation. D
isorders such as schizophrenia and depression were pictured as a decompensa
tion of the basic personality. This article traces the evolution of Millon'
s theory from the original inception, through the influence of the 3rd and
4th editions of the Diagnostic and Statistical Manual of Mental Disorders,
and onto its present form. Now visualized as resulting from 3 polarities, t
he model has expanded the number of personalities to include 3 additional p
rototypes.