I had to say yes it is a science because it is more of a science than say a blind meandering about into the minds of individual's where diagnosis is based largely on theory and superstition and the particular religious beliefs of each patient...such as psychiatry was in its infancy. Thank God we are out of that brutal stage of non scientific approach to the human psyche. Heck we have come a long way since Freud even! However, we still have much to learn about the human mind and what is actual psychosis and what might be something that is actually spiritual in nature...we may never reach the point of it being an exact science but when you think about it NO science is truly exact when humans are involved