The APA Thesaurus offers the following definition: Analysis, evaluation or prediction of disordered or abnormal behavior, symptoms, or other aspects of psychological functioning, includes assessing the appropriateness of a particular treatment and the degree or likelihood of clinical improvement.
Preconceived definition, to form a conception or opinion of beforehand, as before seeing evidence or as a result of previously held prejudice. See more. Dictionary.com
Prepossession(noun) preoccupation; prior possession. Prepossession(noun) preoccupation of the mind by an opinion, or impression, already formed; preconceived opinion; previous impression; bias; -- generally, but not always, used in a favorable sense; as, the prepossessions of childhood.