Interaction With Antisocial Peers Scale

Abstract

The Interaction With Antisocial Peers Scale (IAPS) is a widely utilized psychometric instrument engineered to evaluate adolescent exposure and relational proximity to delinquent and norm-violating peer networks. Developed by the Social Development Research Group (SDRG) at the University of Washington, the scale serves as an integral subscale within the Communities That Care Youth Survey (CTC-YS) and the Student Survey of Risk and Protective Factors (SSRPF). Composed of six targeted self-report items, the instrument quantifies the number of an individual’s closest peers (operationalized across a respondent’s four closest friends) who have engaged in overt antisocial acts over the preceding 12-month period. These behaviors encompass school suspension, illicit firearm carriage, illicit substance distribution, motor vehicle theft, formal law enforcement arrest, and secondary school non-completion (dropping out). Responses are captured using a 5-point, peer-referenced Likert-type gradient ranging from 0 (“None of my friends”) to 4 (“4 of my friends”).

Extensive psychometric investigations substantiate the unidimensional construct validity of the IAPS, demonstrating high internal consistency coefficients (Cronbach’s α typically ranging between .78 and .88 across diverse epidemiological samples of middle- and high-school youths). Confirmatory factor analytic (CFA) investigations demonstrate robust factor loadings (> .60) and exceptional model fit across racial, ethnic, and gender demographics, confirming strict measurement invariance. The scale exhibits profound predictive validity for subsequent personal delinquency, violent conduct, substance abuse, and juvenile justice involvement. Originally endorsed within the Core Measures taxonomy of the Substance Abuse and Mental Health Services Administration (SAMHSA) Center for Substance Abuse Prevention (CSAP), the IAPS remains an indispensable methodological cornerstone in developmental psychopathology, criminology, and prevention science.

Keywords

Interaction With Antisocial Peers Scale, peer delinquency, Social Development Model, risk and protective factors, Communities That Care, adolescent antisocial behavior, externalizing psychopathology, delinquency assessment, juvenile crime, developmental psychopathology, substance abuse prevention, SDRG

Authors

The Interaction With Antisocial Peers Scale was conceived and standardized by researchers at the Social Development Research Group (SDRG), housed within the School of Social Work at the University of Washington in Seattle, Washington, United States. Key principal investigators responsible for the architectural development, psychometric operationalization, and longitudinal validation of the parent Communities That Care (CTC) survey architecture include:

• J. David Hawkins, Ph.D. — Emeritus Professor of Social Work and Founding Director of the Social Development Research Group, University of Washington. Renowned developer of the Social Development Model.
• Richard F. Catalano, Ph.D. — Emeritus Professor of Social Work and former Director of the Social Development Research Group, University of Washington. Co-developer of the Communities That Care operating system and the Social Development Model.
• Michael W. Arthur, Ph.D. — Research Professor and Senior Investigator, Social Development Research Group, University of Washington. Lead psychometrician on the standardized measurement of risk and protective factors.

Institutional Contact Information:
Social Development Research Group
University of Washington
9725 3rd Ave. NE, Suite 401
Seattle, WA 98115-2024, USA
Telephone: +1 (206) 685-3858
Website: http://depts.washington.edu/sdrg/

Purpose

The overarching purpose of the Interaction With Antisocial Peers Scale is to provide an empirically rigorous, standardized, and parsimonious assessment of the degree to which an adolescent’s immediate social environment reinforces and models norm-violating, illegal, and destructive behaviors. Peer affiliation represents one of the most potent and proximate correlates of adolescent problem behavior identified in longitudinal epidemiological literature. By quantifying an individual’s peer-group saturation with antisocial role models, the IAPS functions as both a clinical risk marker and a vital population-level diagnostic instrument.

Theoretical and Epidemiological Rationale

Adolescence is defined neurodevelopmentally by a heightened sensitivity to peer social incentives, status markers, and socioemotional cues, coupled with an ongoing maturation of the prefrontal executive control network. During this window, affiliation with antisocial peers acts not merely as a passive marker of a youth’s personal inclinations, but as an active, causal incubator that accelerates behavioral deviance through social reinforcement, deviancy training, and the diffusion of behavioral opportunity. The IAPS addresses the critical empirical need to isolate this environmental risk factor cleanly, circumventing generalized subjective judgments (e.g., “Do your friends get into trouble?”) by anchoring queries to objective, observable behavioral milestones over the preceding twelve months within the respondent’s closest primary friendship network.

Research Applications

In developmental and sociological research, the scale is routinely employed to:

• Examine the complex transactional pathways between individual dispositional vulnerabilities (such as low self-regulation, impulsivity, or early oppositional behavior) and subsequent criminal conduct.
• Disentangle selection effects (homophily, or the “birds of a feather flock together” hypothesis) from socialization effects (the escalating pressure toward conformity once embedded within a deviant cluster).
• Serve as a primary or secondary mediator in randomized controlled trials evaluating youth violence prevention programs, family-strengthening curricula, and community-wide public health interventions such as Communities That Care (CTC).

Clinical and Preventive Applications

Within clinical, school psychology, and juvenile diversion frameworks, the IAPS aids practitioners in:

• Conducting targeted risk-need-responsivity (RNR) profiles to ascertain whether an adolescent’s externalizing behaviors are entrenched within an unsupportive or criminogenic peer dynamic.
• Formulating ecological intervention plans that intentionally disrupt deviant peer clustering and facilitate integration into prosocial community, artistic, athletic, or academic settings.
• Monitoring longitudinal progress during restorative justice interventions, multisystemic therapy (MST), or multidimensional treatment foster care (MTFC).

Psychological Construct

The psychological construct evaluated by the IAPS is interaction with antisocial peers, situated ecologically within the peer-domain risk architecture of adolescent development. Antisocial peer interaction is conceptualized as the frequency, intimacy, and saturation of affiliations with close friends who actively transgress institutional rules, criminal statutes, and social expectations.

Operationalization via the “Closest Four” Friends Method

A classic methodological vulnerability in peer network research is the “projection bias” or false consensus effect, wherein an adolescent projects their own illicit behaviors onto an ill-defined peer group. To mitigate this bias, the SDRG psychometric framework constrains the cognitive frame of reference: respondents are explicitly directed to reflect upon their four best friends (the specific individuals with whom they share the highest relational intimacy). Restricting the estimation pool to the primary friendship circle yields significantly higher concordance rates with collateral and sociometric network reports than unbounded queries regarding “friends in general.”

Behavioral Spectrum of the Construct

The construct spans an escalating gradient of nonconforming and antisocial domains:

• Academic Alienation and Institutional Detachment: Evaluated through item indicators capturing friends who have been formally suspended from school or who have dropped out entirely. These indices represent institutional disengagement and structural vulnerability, signaling exposure to peers who reject normative conventional pathways.
• Illicit Substance Distribution: Captured through items querying friends engaged in selling illegal drugs. This behavior represents not merely experimental recreational consumption, but direct interface with illicit supply chains, commercial criminality, and elevated threats of physical violence.
• Property Crime and Theft: Operationalized through motor vehicle theft (stolen or attempted to steal cars or motorcycles). In developmental criminology, auto theft serves as a recognized bellwether of chronic, severe delinquent escalation rather than transient minor mischief.
• Lethal Means and Violent Delinquency: Assessed via handgun carriage, which introduces an acute vector of mortality and serious physical morbidity. Handgun possession among adolescents drastically amplifies the lethal trajectory of routine adolescent conflict.
• Formal Criminogenic Contact: Measured via formal arrests by law enforcement agencies. This indicator captures peers whose behavior has breached community tolerance thresholds sufficiently to provoke official juvenile justice system intervention.

Theoretical Framework

The conceptual foundation of the Interaction With Antisocial Peers Scale is deeply rooted in contemporary sociological, criminological, and developmental psychological paradigms, most notably the Social Development Model (SDM), alongside Differential Association Theory and Coercion / Deviancy Training Theory.

The Social Development Model (SDM)

Formulated by J. David Hawkins and Richard F. Catalano, the Social Development Model synthesizes elements of social control theory (Travis Hirschi), social learning theory (Albert Bandura), and differential association theory (Edwin Sutherland). The SDM posits that human beings undergo socialization through sequential interactions within primary socializing units: families, schools, peer groups, and broader communities.

According to the SDM, individuals develop bonds to these units through four interconnected processes: opportunities for involvement, actual participation, the skills required to perform within that unit, and the reinforcement or rewards experienced from engagement. When an adolescent forms a robust affective bond to an antisocial peer group, the behavioral standards, values, and norms internalized reflect that peer group’s culture. Consequently, prosocial conventional restraints are dissolved, and delinquent behaviors are reinforced, legitimized, and incentivized.

Differential Association and Social Learning

Sutherland’s differential association theory asserts that criminal and delinquent behavior is learned through interpersonal communication in intimate groups. The process includes acquiring both the techniques of committing offenses and the motives, drives, rationalizations, and attitudes favorable to the violation of the law. Affiliation with delinquent peers, as assessed by the IAPS, provides the primary behavioral curriculum wherein youth observe positive definitions of deviance, witness modeling of illegal acts, and obtain peer social status contingent upon rule violation.

Deviancy Training and Peer Contagion

Complementing the SDM, developmental psychologist Thomas J. Dishion and colleagues articulated the mechanism of deviancy training. Deviancy training denotes the micro-interactional dynamic wherein rule-breaking discussions and antisocial posturing are met with nonverbal approval, laughter, and verbal validation from peers, whereas prosocial talk is extinguished through apathy, silence, or social censure. The IAPS directly quantifies the environmental density of peers who supply these maladaptive contingency schedules.

Validity

The validity of the IAPS has been corroborated across numerous large-scale multi-cohort longitudinal investigations, statewide youth risk behavior censuses, and cross-national replication trials encompassing hundreds of thousands of adolescents.

Construct Validity

Construct validity is evidenced by the clear convergent relationships established between the IAPS and related psychometric inventories. Extensive data derived from the Communities That Care Youth Survey standardization samples demonstrate that scores on the IAPS correlate positively and robustly with measures of:

• Favorable Attitudes Toward Antisocial Behavior (r = .48 to .62, p < .001)
• Favorable Attitudes Toward Drug Use (r = .42 to .56, p < .001)
• Rebelliousness and Sensation Seeking (r = .35 to .49, p < .001)
• Perceived Availability of Handguns and Drugs in the Community (r = .38 to .51, p < .001)

Conversely, the scale exhibits established divergent validity via inverse correlations with protective construct metrics, including School Commitment and Attachment (r = -.30 to -.45), Prosocial Peer Involvement (r = -.38 to -.52), and Parental Monitoring and Involvement (r = -.28 to -.40).

Criterion and Predictive Validity

Longitudinal structural equation modeling (SEM) demonstrates that IAPS scores predict past-year and prospective violent offenses, property destruction, and polysubstance initiation. In landmark longitudinal validations (e.g., Arthur et al., 2002; Hawkins et al., 2008), higher baseline scores on the IAPS significantly predicted increased odds of subsequent felony arrest, school expulsion, and the onset of substance dependence over 1-, 2-, and 5-year longitudinal follow-up waves, controlling for baseline delinquent involvement. Odds ratios (ORs) for self-reported violent crime per unit increase on the antisocial peer score typically exceed 2.10 to 3.45 in multivariate logistic regression models.

Cross-Cultural and Cross-National Validity

The scale has undergone formal psychometric testing internationally, demonstrating structural equivalence in jurisdictions such as Australia (Beyers et al., 2004), the Netherlands (Glaser et al., 2005), and Latin America. Factor patterns, metric invariance, and predictive gradients remain stable across varied socioeconomic and geopolitical structures.

Reliability

The Interaction With Antisocial Peers Scale exhibits robust internal consistency and temporal stability across diverse adolescent demographics.

Internal Consistency (Cronbach’s Alpha & Omega)

Across the standard developmental bands examined during CTC-YS state and national normative evaluations (grades 6 through 12, ages 11 to 18), the IAPS demonstrates high internal consistency coefficients:

• Middle School Samples (Grades 6–8): Cronbach’s α typically ranges from .76 to .83, reflecting lower base-rate endorsement of high-severity items (e.g., handgun carriage, auto theft) but consistent inter-item covariance.
• High School Samples (Grades 9–12): Cronbach’s α routinely ranges between .82 and .88, reflecting elevated variance and heightened base-rate engagement across all delinquent domains.
• Composite Population Surveys: McDonald’s omega (ω) values frequently approximate .85, indicating that the composite true-score variance is predominantly attributable to the underlying general peer-delinquency factor.

Test-Retest Stability

Short-term test-retest assessments administered across intervals of two to four weeks have yielded stability coefficients ranging from r = .79 to .86, demonstrating that youths provide consistent depictions of their core social networks when assessing stable friendship circles. Over extended longitudinal windows (12 to 24 months), autoregressive coefficients remain moderate to high (r = .45 to .60), illustrating expected developmental fluctuation in peer friendship networks while capturing stable rank-order developmental trajectories.

Factor Analysis

The dimensional structure of the IAPS has been exhaustively scrutinized using both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA).

Exploratory Factor Analysis (EFA)

Principal axis factoring and maximum likelihood EFA across both pilot and large-scale epidemiological samples consistently uncover a distinct unidimensional construct. Eigenvalue extraction yields a single dominant factor exceeding unity (eigenvalues typically between 2.80 and 3.40), accounting for 48% to 62% of the total variance across items. The ratio of the first-to-second eigenvalue routinely exceeds 4:1, confirming the structural coherence of a single underlying peer delinquency dimension.

Confirmatory Factor Analysis (CFA)

In structural CFA models conducted within the broader multi-domain architecture of the Communities That Care Youth Survey, the six items load strongly and significantly onto a unified latent factor labeled “Interaction with Antisocial Peers”:

• Item 1 (School Suspension): Standardized factor loadings range between .58 and .68.
• Item 2 (Handgun Carriage): Standardized factor loadings range between .62 and .74.
• Item 3 (Drug Sales): Standardized factor loadings range between .70 and .82.
• Item 4 (Motor Vehicle Theft): Standardized factor loadings range between .72 and .84.
• Item 5 (Arrested by Police): Standardized factor loadings range between .74 and .85.
• Item 6 (School Dropout): Standardized factor loadings range between .52 and .65.

Goodness-of-Fit Parameters

Structural evaluations using robust maximum likelihood estimation (MLR) and weighted least squares mean and variance adjusted (WLSMV) estimators demonstrate excellent fit to the empirical data:

• Comparative Fit Index (CFI) ≥ .96 to .99
• Tucker-Lewis Index (TLI) ≥ .95 to .98
• Root Mean Square Error of Approximation (RMSEA) ≤ .035 to .052 (90% CI [.028, .058])
• Standardized Root Mean Square Residual (SRMR) ≤ .024 to .038

Measurement Invariance

Multi-group CFA studies confirm that the IAPS fulfills stringent criteria for configural, metric (weak), and scalar (strong) invariance across biological sex (males vs. females) and across diverse racial and ethnic subgroups (White, Black, Hispanic, Native American, and Asian American adolescents). This ensures that variations in composite scale scores reflect genuine discrepancies in peer-group behavioral saturation rather than idiosyncratic response styles or divergent construct interpretations.

Instrument / Measurement Tool

• Full Instrument Name: Interaction With Antisocial Peers Scale (IAPS)
• Parent Inventory: Communities That Care Youth Survey (CTC-YS) / Student Survey of Risk and Protective Factors (SSRPF)
• Instrument Type: Peer-referenced self-report behavioral rating scale
• Target Population: Adolescents and youth aged approximately 11 to 18 years (Grades 6 through 12)
• Item Count: 6 items
• Time Required for Completion: Approximately 2 to 4 minutes
• Administration Modality: Paper-and-pencil self-administered questionnaire, computerized online survey platform, or guided classroom-administered survey
• Response Scale: 5-point peer-referenced frequency scale:
  • None of my friends (Scored as 0 or 1, depending on coding system)
  • 1 of my friends (Scored as 1 or 2)
  • 2 of my friends (Scored as 2 or 3)
  • 3 of my friends (Scored as 3 or 4)
  • 4 of my friends (Scored as 4 or 5)
• Scoring and Indexing Procedures:
  • Additive Summed Score: Raw item scores are summed to generate an aggregate score ranging from 0 to 24 (when using a 0–4 scale) or 6 to 30 (when using a 1–5 scale). Higher scores represent elevated saturation of delinquent models within the youth’s immediate peer ecology.
  • Mean Indexing: Items are averaged to generate a mean composite score ranging from 0.00 to 4.00 (or 1.00 to 5.00), preserving the interpretable scale metric. Missing data are conventionally handled using mean substitution if fewer than 2 items are missing, or via Full Information Maximum Likelihood (FIML) algorithms in structural modeling.
  • Risk Cutoff Percentiles: In community epidemiology, raw scores are frequently transformed into standardized T-scores or dichotomized using established national normative cut-points (e.g., scores exceeding the 65th or 75th percentile classified as elevated peer-domain risk).

Permissions & Fee and Test Year

The Interaction With Antisocial Peers Scale was formalized and standardized in its current 6-item format during the late 1990s and early 2000s under grants funded by the Center for Substance Abuse Prevention (CSAP), the National Institute on Drug Abuse (NIDA), and the Office of Juvenile Justice and Delinquency Prevention (OJJDP). Key psychometric validation studies emerged between 1999 and 2002 (e.g., Arthur et al., 2002; Hawkins et al., 2002).

Licensing and Accessibility: The scale was developed with public federal funding and was integrated into the public domain via the CSAP Core Measures documentation (pages 100–102). It is non-proprietary and may be utilized by academic researchers, school districts, community coalitions, and public health agencies free of royalty or licensing fees. Academic and applied users are requested to provide appropriate scholarly attribution to the Social Development Research Group at the University of Washington and cite the primary validation manuscripts. Commercial redistribution or incorporation into proprietary paid commercial software without authorization is subject to standard copyright protections governing university-generated intellectual output.

References

• Arthur, M. W., Hawkins, J. D., Pollard, J. A., Catalano, R. F., & Baglioni, A. J. (2002). Measuring risk and protective factors for substance use, delinquency, and other adolescent problem behaviors: The Communities That Care Youth Survey. Journal of Adolescent Health, 31(6), 502–511. https://doi.org/10.1016/S1054-139X(02)00445-5
• Beyers, J. M., Toumbourou, J. W., Catalano, R. F., Arthur, M. W., & Hawkins, J. D. (2004). A cross-national comparison of risk and protective factors for adolescent substance use: The United States and Australia. Journal of Adolescent Health, 35(1), 3–16. https://doi.org/10.1016/j.jadohealth.2003.08.015
• Catalano, R. F., & Hawkins, J. D. (1996). The social development model: A theory of antisocial behavior. In J. D. Hawkins (Ed.), Delinquency and crime: Current theories (pp. 149–197). Cambridge University Press. https://doi.org/10.1017/CBO9780511527623.007
• Center for Substance Abuse Prevention. (1999). CSAP’s Core Measures: A guide for prevention practitioners (pp. 100–102). Substance Abuse and Mental Health Services Administration (SAMHSA).
• Dishion, T. J., McCord, J., & Poulin, F. (1999). When interventions harm: Peer groups and problem behavior. American Psychologist, 54(9), 755–764. https://doi.org/10.1037/0003-066X.54.9.755
• Glaser, R. R., Van Horn, M. L., Arthur, M. W., & Hawkins, J. D. (2005). Measurement properties of the Communities That Care Youth Survey across demographic groups. Journal of Quantitative Criminology, 21(1), 73–102. https://doi.org/10.1007/s10940-004-1788-1
• Hawkins, J. D., Catalano, R. F., & Arthur, M. W. (2002). Promoting science-based prevention in communities. Addictive Behaviors, 27(6), 951–976. https://doi.org/10.1016/S0306-4603(02)00298-8
• Hawkins, J. D., Catalano, R. F., Kosterman, R., Abbott, R., & Hill, K. G. (1999). Preventing adolescent health-risk behaviors by strengthening protection during childhood. Archives of Pediatrics & Adolescent Medicine, 153(3), 226–234. https://doi.org/10.1001/archpedi.153.3.226

13. Items of the Scale (Questionnaire)