Structured professional judgment (SPJ) is a formal method of evaluating the risk of future violence. Such evaluations are required in numerous contexts, such as parole decisions, release from forensic hospitals, civil commitment, when violence threatens the workplace, among others. Originating in the mid-1990s, the SPJ approach consists of a family of risk assessment measures devoted to specific types of violence. This entry reviews the following topics: brief description of the SPJ approach, SPJ instruments, core assumptions of SPJ, use of the SPJ model in practice, and research support for SPJ.