In the first edition, Grisso presented and organized principles for forensic mental health evaluations, principles that have guided the field since that time. He recommended that forensic mental health evaluations be based on a careful analysis of the psycholegal issues involved in each legal proceeding and that empirically based forensic assessment instruments be developed to evaluate specific competencies and functional capacities. In a thoughtful analysis, Grisso articulated six components of legal competencies: functional, contextual, causal, interactive, judgmental, and dispositional. No one had previously described the components of each legal competency. Moreover, no one had proposed the idea—novel at the time, but in retrospect reasonable—that some situations demand higher levels of competency than others, depending on the complexity of the individual's legal situation.