The Jesness Inventory Classification System is a simple, objective method for classifying offenders into one of nine subtypes. Having its origin in the I-level classification, the JI system has gone through a long evolution. The procedure for classification now requires only the responses to the 155-item Jesness Inventory, which can be hand-scored. Studies with both delinquents and nondelinquents have shown the classification to be comprehensive and valid.
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