Interview Schedule for Social Interaction (sample)

1. Abstract

The Interview Schedule for Social Interaction (sample) (ISSI) is a seminal psychiatric and epidemiological measurement instrument developed by A. Scott Henderson and colleagues in 1980 at the Australian National University. Designed to provide a sophisticated, multidimensional assessment of an individual’s personal social environment, the ISSI addresses key methodological limitations of early social support metrics by rigorously bifurcating social relationships into two structural domains—Attachment (close, intimate, confiding ties) and Social Integration (broader, diffuse, community, and acquaintance networks)—and evaluating each through the dual lenses of objective Availability and subjective Adequacy. The instrument yields four primary psychometric subscales: Availability of Attachment (AVAT), Adequacy of Attachment (ADAT), Availability of Social Integration (AVSI), and Adequacy of Social Integration (ADSI). Administered primarily via a standardized, semi-structured clinical interview featuring a branching logic, respondents first indicate the objective existence or frequency of interpersonal resources (binary coding: 0 = No, 1 = Yes) followed by nuanced appraisal items measuring interpersonal satisfaction, perceived deficits, or preferred social distance.

Psychometric evaluations across community-dwelling cohorts, clinical psychiatric samples, and longitudinal epidemiology (such as the landmark Canberra population studies) have demonstrated high internal consistency across subscales (Cronbach’s alpha typically ranging from .70 to .85), excellent inter-rater reliability (Cohen’s kappa > .80), and moderate to high test-retest stability over intervals spanning two weeks to six months. Construct and predictive validity are robust: deficits in the adequacy of intimate attachment (ADAT) have consistently emerged as powerful prospective predictors of non-psychotic psychiatric morbidity, neurosis, and major depressive episodes, particularly in the presence of acute life stressors. This article delineates the operational framework, theoretical lineage, psychometric validation profile, factor structure, scoring algorithms, and the complete 23-item representative interview protocol of the ISSI.

2. Keywords

Interview Schedule for Social Interaction, ISSI, social support, attachment theory, social integration, psychiatric epidemiology, interpersonal relationships, loneliness, neuroticism, psychometrics

3. Authors

The primary development and empirical validation of the Interview Schedule for Social Interaction were conducted by a distinguished multidisciplinary research team based at the Social Psychiatry Research Unit of the National Health and Medical Research Council (NH&MRC) at The Australian National University (Canberra, Australia):

• A. Scott Henderson, M.D., FRACP, FRCPsych: Foundation Director of the Social Psychiatry Research Unit, The Australian National University, Canberra, Australia. Renowned for foundational contributions to psychiatric epidemiology, affective disorders, and the operationalization of social ties in mental illness.
• Paul Duncan-Jones, M.A.: Senior Research Fellow and Chief Methodologist/Statistician, Social Psychiatry Research Unit, The Australian National University, Canberra, Australia. Responsible for psychometric modeling, item response evaluation, and latent structure analyses.
• Don G. Byrne, Ph.D.: Research Fellow in Clinical and Behavioral Psychology, Social Psychiatry Research Unit, The Australian National University (subsequently Professor of Psychology, Department of Psychology, ANU). Specializing in behavioral medicine, cardiovascular behavioral risk, and stress appraisal.
• Ruth Scott, B.A., Dip.Soc.Stud.: Research Social Worker and Clinical Interviewer, Social Psychiatry Research Unit, The Australian National University, Canberra, Australia. Instrumental in interview operationalization, question formatting, and qualitative coding reliability.

4. Purpose

The primary objective of the Interview Schedule for Social Interaction is to systematically and quantitatively measure an individual’s interpersonal ecosystem, isolating the specific dimensions of social relationships that confer resilience against or vulnerability to psychological disorders. Developed during an era when psychiatric research frequently treated “social support” as a vague, monolithic construct, the ISSI was created to address profound conceptual and methodological deficits in psychiatric epidemiology. Prior to its introduction, research instruments often conflated the mere existence of social ties (network size, marital status, frequency of contact) with the internal psychological experience of being supported, understood, and emotionally secure.

In both clinical and epidemiological contexts, the ISSI serves several distinct functions:

• Distinguishing Structural versus Functional Dimensions: It explicitly separates the quantitative presence of human relationships (Availability) from the subjective appraisal of whether those relationships meet the person’s emotional and practical needs (Adequacy).
• Differentiating Network Levels: It operationalizes relationships across a continuum ranging from highly specialized, primary emotional attachments (confidants, life partners) to broad, diffuse social networks (colleagues, neighbors, voluntary associations, casual acquaintances).
• Investigating the Stress-Buffering Hypothesis: In research on stress and coping, the ISSI enables scholars to determine whether the objective presence of ties or the subjective satisfaction with those ties acts as an authentic buffer against life events, chronic difficulties, and the onset of neurotic disorders.
• Clinical Diagnosis and Formulation: In clinical settings, the ISSI facilitates comprehensive social network mapping. It identifies specific interpersonal deficits (e.g., adequate integration into recreational groups coupled with a severe absence of a confiding attachment figure), thereby directing targeted psychosocial interventions, family therapy, or interpersonal psychotherapy (IPT).
• Epidemiological Surveillance: As demonstrated in the Canberra population studies and subsequent cross-cultural research, the ISSI provides standardized, continuous metric scores suitable for large-scale longitudinal regression modeling, path analysis, and survival models predicting depressive relapse and psychiatric admissions.

5. Psychological Construct

The Interview Schedule for Social Interaction operationalizes social ties through a classic 2 × 2 matrix crossing the type of social provision with the evaluative dimension. This conceptual framework yields four core psychological constructs:

Availability of Attachment (AVAT)

AVAT evaluates the objective presence, accessibility, and structural reality of deeply intimate, affectional bonds. Rooted in ethological and psychodynamic attachment concepts, this dimension assesses whether the respondent has one or more persons who provide emotional security, unconditional warmth, and mutual confiding. Questions explore whether the respondent has a primary person with whom they can share their most private vulnerabilities, who can provide comfort during acute distress, and who acts as an attachment figure. AVAT is scored primarily through binary affirmations indicating that such persons exist in the respondent’s current living environment.

Adequacy of Attachment (ADAT)

ADAT shifts the focus from objective availability to the respondent’s cognitive and affective appraisal of their intimate bonds. Even if an attachment figure is available (e.g., a spouse or parent), the relationship may be fraught with conflict, emotional detachment, or superficiality. Conversely, an individual with very few attachment figures may find their single bond deeply satisfying. ADAT assesses whether the respondent desires greater intimacy, wishes they could share more private feelings with their confidant, or seeks additional confiding partners. Low scores on ADAT reflect profound perceived emotional isolation, subjective deprivation, and unmet relational yearnings, which have consistently demonstrated the strongest direct correlation with clinical depression and neurotic symptoms.

Availability of Social Integration (AVSI)

AVSI captures the structural breadth of the respondent’s wider social network. Drawing on sociological concepts of social cohesion and solidarity, this construct encompasses membership in casual social groups, interactions with colleagues in the workplace, familiarity with neighbors, casual dropping-in patterns, and engagement in recreational, cultural, or religious groups. It reflects the individual’s embeddedness in the community and the accessibility of a diffuse network capable of providing practical instrumental help, casual companionship, and a sense of shared belonging.

Adequacy of Social Integration (ADSI)

ADSI evaluates the respondent’s subjective satisfaction with their broader network and community ties. It operationalizes whether the respondent feels they have sufficient acquaintances, whether they desire more casual friends with whom to pursue leisure activities, and whether their day-to-day social interactions satisfy their need for belonging. Deficits in ADSI represent social alienation, anomie, and dissatisfaction with one’s public or peer-level relational footprint, distinct from the deep, dyadic emotional loneliness captured by ADAT.

6. Theoretical Framework

The conceptual architecture of the ISSI is anchored primarily in two seminal theoretical traditions: Attachment Theory as formulated by John Bowlby and the Social Provisions Model advanced by Robert S. Weiss.

Bowlby’s Attachment and Affectional Bonds

Henderson and colleagues explicitly drew upon Bowlby’s (1969, 1973) ethological theory of attachment, which posits that humans possess an innate, biologically rooted drive to seek proximity to specific attachment figures who provide a “safe haven” during adversity and a “secure base” for exploring the environment. While Bowlby primarily studied infant-caregiver dyads, Henderson recognized that affectional bonds remain fundamental throughout adulthood. In the ISSI framework, attachment is conceptualized not as a diffuse social property, but as a specific, dyadic bond characterized by deep intimacy, mutual trust, and the sharing of private emotional states. The absence or perceived inadequacy of such bonds triggers protest, despair, and psychological disorganization, predisposing the individual to affective disorders when external life stressors disrupt personal equilibrium.

Weiss’s Typology of Relational Provisions

The ISSI heavily incorporates Robert S. Weiss’s (1974) functional taxonomy of interpersonal relationships, which posits that different types of social relationships provide distinct psychological provisions, all of which are essential for well-being:

• Attachment: Provided by intimate dyadic partnerships, yielding a sense of emotional safety and comfort. Its absence produces the “loneliness of emotional isolation.”
• Social Integration: Provided by a network of relationships sharing common interests, activities, and concerns, yielding a sense of belonging and companionship. Its absence produces the “loneliness of social isolation.”
• Reassurance of Worth: Affirmed by colleagues and peers who recognize one’s competence and social role.
• Reliable Alliance: Typically offered by kin, ensuring practical and instrumental support during emergency situations.

By mapping Weiss’s distinction between emotional isolation (deficits in attachment) and social isolation (deficits in integration) directly onto empirical interview schedules, Henderson et al. operationalized these theoretical distinctions into quantifiable epidemiological indices.

The Vulnerability and Stress-Buffering Hypothesis

A foundational theoretical premise of the ISSI was the systematic testing of George Brown’s social model of depression (Brown & Harris, 1978). Henderson and colleagues sought to ascertain whether social relationships act as independent main effects on psychological health or whether they function primarily as vulnerability factors that moderate the impact of severe life events. Through the ISSI, the authors hypothesized—and subsequently demonstrated—that while social integration provides broad psychosocial stability, it is specifically the subjective adequacy of attachment that serves as the crucial buffer preventing the decompensation of personality into neurotic symptoms during severe adversity.

7. Validity

The psychometric validity of the ISSI has been comprehensively scrutinized across community surveys, prospective longitudinal investigations, and cross-cultural adaptations.

Construct and Convergent Validity

Construct validity was initially established by demonstrating that the four subscales correlate in theoretically predictable directions with established psychological constructs. AVSI correlates substantially with objective measures of social activity, household size, employment status, and organizational memberships (Pearson r typically .45 to .65). In contrast, AVAT shows specific convergence with marital status, cohabitation, and deep relational stability. ADAT and ADSI correlate negatively with standardized measures of loneliness (such as the UCLA Loneliness Scale, r = -.55 to -.70) and neuroticism on the Eysenck Personality Questionnaire (EPQ).

Discriminant Validity

A crucial psychometric milestone of the ISSI was proving that perceived adequacy of social ties was not merely a retrospective reporting artifact of depressive affect or neurotic personality traits. Henderson et al. (1981) demonstrated through structural equation modeling that although neuroticism does influence the reporting of interpersonal adequacy, the constructs of ADAT and ADSI retain significant, independent variance that cannot be accounted for by trait negative affectivity or baseline psychological distress.

Predictive and Longitudinal Validity

The predictive validity of the ISSI represents its strongest empirical asset. In the prospective Canberra Population Study involving repeated assessments of over 750 adults, Henderson and colleagues (1981) demonstrated that baseline deficits in Adequacy of Attachment (ADAT) significantly predicted the subsequent onset of minor psychiatric morbidity and neurotic depression over a 12-month follow-up window, particularly following adverse life events. Interestingly, Availability of Social Integration (AVSI) alone did not buffer against psychiatric symptoms, highlighting the vital theoretical insight that having numerous acquaintances does not protect against depression if qualitative, intimate attachment needs remain unfulfilled.

8. Reliability

The ISSI exhibits robust psychometric reliability across internal consistency, inter-rater reliability, and longitudinal test-retest assessments.

Internal Consistency

In original population validation samples and subsequent clinical investigations, the four subscales have demonstrated moderate to high internal consistency coefficients (Cronbach’s alpha):

• Availability of Social Integration (AVSI): Alpha values consistently range between .75 and .82, reflecting coherent item coverage across diverse community activities and recreational networks.
• Adequacy of Social Integration (ADSI): Alpha values range between .72 and .80.
• Availability of Attachment (AVAT): Alpha values range between .70 and .78; because this scale taps a highly specific, low-frequency primary construct (confidants and primary attachment figures), item redundancy is minimized by design.
• Adequacy of Attachment (ADAT): Alpha values range between .76 and .84, indicating high internal uniformity in capturing perceived satisfaction and longing for emotional closeness.

Inter-Rater Reliability

Because the ISSI is conducted as a semi-structured interview requiring interviewers to apply branching rules and probe ambiguous answers, inter-rater reliability is paramount. Paired interviewers evaluating identical live or tape-recorded interviews have yielded intra-class correlation coefficients (ICC) exceeding .90 across all four primary subscales, with item-level Cohen’s kappa values consistently falling between .82 and .96.

Test-Retest Reliability

Temporal stability assessments over short intervals (2 to 4 weeks) have produced test-retest correlation coefficients ranging from .78 to .88 for AVSI and AVAT, and from .70 to .82 for ADSI and ADAT. Over longer spans (6 to 12 months), stability coefficients remain moderately high (.50 to .65), reflecting the dual reality that while core network structures and personality-driven attachment appraisals maintain relative temporal consistency, subjective relational adequacy responds dynamically to major life events, relationship dissolutions, and geographic relocations.

9. Factor Analysis

The structural dimensionality of the ISSI has been evaluated using both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) across diverse international populations.

Exploratory Factor Structure

In the foundational psychometric work by Duncan-Jones (1981), principal components analysis followed by oblique and orthogonal (Varimax) rotations clearly extracted four primary factors mirroring the theoretical 2 × 2 architecture:

• Factor 1 (Social Integration – Availability): Items loading heavily (> .45) on this factor involve workplace socialization, neighboring contacts, participation in clubs or societies, and casual mutual home visits.
• Factor 2 (Attachment – Adequacy): Items loading heavily (> .50) evaluate desires for deeper sharing, longing for additional confidants, and perceived deficits in genuine affection and emotional security.
• Factor 3 (Social Integration – Adequacy): Items loading primarily reflect the subjective satisfaction with the volume of casual social contacts and feelings of having enough people to mix with socially.
• Factor 4 (Attachment – Availability): Items loading on this factor reflect the confirmed, objective presence of a confidant, a reliable advice-giver, and an individual providing affection and emotional warmth.

Confirmatory Factor Analysis and Model Fit

Subsequent structural modeling has substantiated the four-factor correlated model over competing one-factor (undifferentiated social support) and two-factor (attachment vs. integration only, or availability vs. adequacy only) models. Fit indices reported across published psychometric investigations demonstrate adequate to excellent fit:

• Comparative Fit Index (CFI): .91 to .95
• Tucker-Lewis Index (TLI): .90 to .94
• Root Mean Square Error of Approximation (RMSEA): .042 to .058 (90% CI [.036, .064])
• Standardized Root Mean Square Residual (SRMR): .048

Correlations between latent factors show that while AVSI and AVAT share moderate structural variance (r ≈ .35 to .45), and ADSI and ADAT demonstrate moderate affective alignment (r ≈ .40 to .50), the structural distinction between availability and adequacy remains empirically distinct, confirming that network size cannot serve as a statistical proxy for network satisfaction.

10. Instrument / Measurement Tool

• Tool Name: Interview Schedule for Social Interaction (sample protocol)
• Alternative Names: ISSI; Henderson Social Interaction Schedule; Shortened / Abbreviated ISSI
• Author Group: A. Scott Henderson, Paul Duncan-Jones, Don G. Byrne, and Ruth Scott (Social Psychiatry Research Unit, Australian National University)
• Assessment Type: Semi-structured clinical/epidemiological interview (also adaptable into self-administered questionnaire format in abbreviated forms)
• Administration Format: Standardized face-to-face or clinical telephone interview utilizing conditional branching logic
• Target Population: Adults (aged 18 and older); adaptable for older adolescent and geriatric cohorts
• Completion Time: Approximately 20 to 45 minutes (depending on full vs. abbreviated sample version and depth of narrative probing)
• Item Count: The representative sample instrument presented herein contains 23 core items capturing the full operational breadth of the subscales (the original extended research schedule contained up to 52 primary and subordinate probes; full-length standardized subscales typically utilize AVAT: 8 items, ADAT: 12 items, AVSI: 16 items, ADSI: 17 items).
• Response Scale: Semi-structured interview branching format: binary occurrence (0=No, 1=Yes) followed by satisfaction ratings (e.g., 1=About right, 2=Depends on situation, 3=More / Prefers no confidant, 4=Like someone else as well, 9=Not applicable)
• Subscales:
  • Availability of Social Integration (AVSI): Items measuring the objective existence of work, neighborhood, club, and leisure contacts.
  • Adequacy of Social Integration (ADSI): Items evaluating satisfaction with the breadth and volume of casual social mixing.
  • Availability of Attachment (AVAT): Items verifying the actual presence of intimate confidants, advice-givers, and emotional caregivers.
  • Adequacy of Attachment (ADAT): Items probing whether emotional ties fulfill the respondent’s needs for closeness, affection, and private confiding.
• Scoring Rules: Yields four primary subscale scores: Availability of Social Integration (AVSI), Adequacy of Social Integration (ADSI), Availability of Attachment (AVAT), and Adequacy of Attachment (ADAT). Items are coded based on presence/availability (0 or 1) and subjective adequacy/satisfaction. Positively appraised items or absence of relational deficits receive higher adequacy scores, whereas endorsements of unfulfilled relational longings or profound interpersonal deficits are coded toward lower adequacy.

11. Permissions & Fee and Test Year

• Publication Year: The primary foundational validation and interview schedule were published in 1980 (Psychological Medicine) with expanded theoretical monographs appearing in 1981.
• Copyright & Intellectual Property: Originally developed under the auspices of the Social Psychiatry Research Unit, National Health and Medical Research Council (NH&MRC) of Australia. Academic rights and primary source documentation are held by the original authors and original publishers (Academic Press / Cambridge University Press).
• Research Accessibility: The ISSI was placed into the public scientific domain for academic, non-commercial epidemiological and psychiatric research. The instrument, full interview protocols, and scoring keys are widely reproduced in academic compendiums and method manuals (such as Ian McDowell’s Measuring Health: A Guide to Rating Scales and Questionnaires, Oxford University Press).
• Commercial Licensing & Fees: No royalties or user fees are required for independent non-commercial academic research or clinical non-profit use. Researchers utilizing the scale are expected to cite the foundational 1980 and 1981 publications. Commercial applications, clinical trials sponsored by for-profit entities, or digital test bank integration should seek permission from the copyright holders or academic successors at the Australian National University.

12. References

• Bowlby, J. (1969). Attachment and loss: Vol. 1. Attachment. Basic Books.
• Bowlby, J. (1973). Attachment and loss: Vol. 2. Separation: Anxiety and anger. Basic Books.
• Brown, G. W., & Harris, T. (1978). Social origins of depression: A study of psychiatric disorder in women. Free Press.
• Duncan-Jones, P. (1981). The structure of social relationships: Analysis of a survey instrument. In S. Henderson, D. G. Byrne, & P. Duncan-Jones (Eds.), Neurosis and the social environment (pp. 147–164). Academic Press.
• Henderson, S. (1980). A development of social psychiatry: The systematic study of social bonds. Journal of Nervous and Mental Disease, 168(2), 63–69. https://doi.org/10.1097/00005053-198002000-00001
• Henderson, S., Duncan-Jones, P., Byrne, D. G., & Scott, R. (1980). Measuring social relationships: The Interview Schedule for Social Interaction. Psychological Medicine, 10(4), 723–734. https://doi.org/10.1017/s0033291700055019
• Henderson, S., Byrne, D. G., & Duncan-Jones, P. (1981). Neurosis and the social environment. Academic Press.
• Henderson, A. S., & Brown, G. W. (1988). Social support: The hypothesis and the evidence. In A. S. Henderson & G. D. Burrows (Eds.), Handbook of social psychiatry (pp. 73–85). Elsevier.
• McDowell, I. (2006). Measuring health: A guide to rating scales and questionnaires (3rd ed.). Oxford University Press. https://doi.org/10.1093/acprof:oso/9780195165678.001.0001
• Weiss, R. S. (1974). The provisions of social relationships. In Z. Rubin (Ed.), Doing unto others (pp. 17–26). Prentice-Hall.

13. Items of the Scale