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Inventory of Offender Risk, Needs and Strengths (IORNS)

The IORNS is a 130-item self-report measure that assesses static risk, dynamic risk/need, and protective strength factors as they relate to recidivism, treatment need, and management.

The IORNS provides index and scale scores that are internally consistent and stable over time, in addition to content subscales that aid in interpretive specificity. The IORNS indexes, scales, and subscales demonstrate good convergent and discriminant validity with self-report, interview, and objective criminal history measures of antisocial behavior, psychopathy, personality pathology, substance use, depression, and anxiety among numerous male and female offender samples.

The IORNS consists of the four IORNS indexes, eight scales, 14 subscales, and two validity scales. T scores, percentiles, confidence intervals, and qualitative classifications (i.e., low, average, high, very high) are provided for the normative samples. Given low or high endorsement of certain items, percentiles and percentile classifications are recommended for interpretation.

Special Features

  • Is the only instrument that assesses all three types of factors (static, dynamic, and protective factors) important to recidivism by providing a more comprehensive risk assessment than is currently available through concomitant assessment.
  • Can be group administered at offender intake, thereby reducing clinician burden.
  • Can be administered and scored by persons who do not have training in forensic or clinical psychology or psychiatry, with supervision and interpretation by a licensed or certified professional. Written at a 3rd-grade reading level.
  • Standardized and validated with offenders (men ages 18-75 years and women ages 18-60 years).
  • Offender samples included incarcerated and probated general and sexual offenders.
  • Community adult/college normative sample also provided (men and women ages 18-75 years).
  • The community adult/college normative group approximates U.S. Census proportions (U.S. Bureau of the Census, 2003) for race/ethnicity and educational status.

The validity of the IORNS is based on multiple sources of evidence, including content validity, convergent and discriminant validity, and internal structure of the measure via factor analysis. Constructs of interest were chosen based on their relationship between recidivism, desistance, or protection and criminal behavior. The IORNS demonstrated significant correlations with self-reported criminal history variables, including number of nonviolent and violent crimes and number of times in jail/prison among male and female offenders. The IORNS also was significantly related to numerous self-reported criminal, familial, and substance use history variables (e.g., past physical and sexual abuse) among female offenders.

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Individual or Group
15 - 20 minutes
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All prices include GST

Product code Product title Price
8040SSPF IORNS Scoring Summary/Profile Forms (pk25) $95.00
8040RF IORNS Response Forms (pk25) $190.00
8040M IORNS Professional Manual $190.00
8040KT IORNS Introductory Kit $550.00