<unk>  (MCDD) is a research category, proposed to involve several neurological and psychological symptoms where at least some symptoms are first noticed during early childhood and persist throughout life. It was originally suggested to be a subtype of autistic spectrum disorders (PDD) with co-morbid schizophrenia or another psychotic disorder; however, there is some controversy that not everyone with MCDD meets criteria for both PDD and psychosis. The term<unk> x developmental disorder was coined by Donald J. Cohen in 1986.
Multiple complex developmental disorder
Autism spectrum
Zellweger spectrum disorders
Pervasive developmental disorder
High-functioning autism
Low-functioning autism
Personality development disorder
Childhood disintegrative disorder