The Rapid Risk Assessment for Sexual Offense Recidivism, abbreviated as the RRASOR (pronounced like the cutting tool), is an actuarial scale designed to assess different levels of sexual recidivism risk for convicted sexual offenders. This scale was the first empirically validated actuarial instrument specifically designed for the assessment of sexual offense recidivism. As such, it served both to change the manner by which people conducted risk assessments and as the stepping stone for the development of second-generation actuarial instrumentation, though it is still being used because of its unique contribution to risk assessment technology. This overview describes the instrument's development, summaries of tests of reliability and validity, how it has been used in furthering risk assessment knowledge, and the reason why it is still used ...