Interview Schedule for Social Interaction (sample)

Abstract

The Interview Schedule for Social Interaction (ISSI) is a seminal psychometric and clinical interview instrument developed by social psychiatrist A. Scott Henderson and colleagues at the Australian National University in 1980. Designed to provide a rigorous, multidimensional assessment of interpersonal relationships, the ISSI operationalizes two distinct relational domains derived from sociological and psychiatric theory: attachment (close, confiding, affectional bonds characterized by emotional depth and perceived security) and social integration (participation in a broader peer network, shared interests, and communal belonging). Crucially, the ISSI distinguishes between the objective or structural presence of social bonds—termed Availability—and the subjective, evaluative satisfaction an individual experiences regarding those bonds—termed Adequacy. This structural bifurcation yields four fundamental psychometric dimensions: Availability of Attachment (AVAT), Adequacy of Attachment (ADAT), Availability of Social Integration (AVSI), and Adequacy of Social Integration (ADSI).

Administered via a semistructured branching interview format, the full ISSI comprises 53 inquiry sequences wherein respondents first complete dichotomous screening or quantitative enumeration questions regarding the presence of specific relational ties (e.g., confidants, crisis companions, social circles) before progressing into satisfaction-rated conditional branches. These contingent inquiries measure whether the respondent perceives the current volume, frequency, or emotional reciprocity of the interaction as “about right,” desires greater intimacy or contact, or experiences perceived interpersonal deficits. Extensive psychometric evaluations demonstrate high internal consistency across dimensions (Cronbach’s alpha ranging from .70 to .85), high test-retest reliability across multi-month intervals (coefficients between .70 and .81), and robust predictive validity in epidemiological investigations of depressive neurosis, anxiety, and general psychological distress. By disentangling structural network architecture from cognitive appraisals of adequacy, the ISSI remains an indispensable foundational instrument in epidemiological psychiatry, clinical psychology, and medical sociology.

Keywords

Interview Schedule for Social Interaction, ISSI, social support assessment, attachment availability, attachment adequacy, social integration, social psychiatry, psychiatric epidemiology, interpersonal relationships, psychometrics

Authors

The Interview Schedule for Social Interaction was conceived and validated by a multidisciplinary team of psychiatric epidemiologists and psychometricians at the National Health and Medical Research Council (NHMRC) Social Psychiatry Research Unit, located within The John Curtin School of Medical Research at the Australian National University (Canberra, Australia):

• A. Scott Henderson, M.D., FRACP, FRCPsych — Director, NHMRC Social Psychiatry Research Unit, Australian National University, Canberra, Australia. Eminent contributor to international psychiatric epidemiology, cognitive aging, and social psychiatry.
• Paul Duncan-Jones, M.A. — Senior Research Fellow in Psychometrics and Medical Statistics, NHMRC Social Psychiatry Research Unit, Australian National University. Specialist in structural equation modeling and longitudinal psychiatric survey design.
• D. G. (Don) Byrne, Ph.D. — Research Psychologist, NHMRC Social Psychiatry Research Unit; subsequently Professor of Psychology at the Australian National University. Renowned for empirical work on behavioral medicine, stress processes, and personality.
• Ruth Scott, B.A. — Research Officer, NHMRC Social Psychiatry Research Unit, Australian National University. Contributed to interview standardization, coding manuals, and field survey administration.

Purpose

The principal objective of the Interview Schedule for Social Interaction is to deliver a systematically standardized, theoretically grounded, and empirically quantifiable measurement of an individual’s social environment. Prior to its introduction in 1980, psychiatric epidemiology frequently relied on crude, one-dimensional indices of social isolation, such as marital status, living arrangements, or simplistic tallies of monthly social encounters. Such rudimentary proxies failed to capture the profound psychological nuances between having numerous superficial contacts versus possessing a single deeply dependable attachment figure, nor could they account for the discrepancy between an objectively sparse network and an individual’s subjective satisfaction with solitary life.

Henderson and his colleagues engineered the ISSI to resolve these conceptual and methodological inadequacies. The instrument operates with two explicit clinical and scientific purposes:

1. Disentangling Quantity from Quality: By establishing dual scoring tracks for structural availability versus perceived adequacy, the ISSI permits researchers to investigate whether psychopathological conditions—such as depressive episodes or non-psychotic neurotic disorders—stem from an absolute environmental deficit of supportive figures or from an intrapsychic dissatisfaction with otherwise adequate social provisions.
2. Differential Mapping of Attachment vs. Community Integration: Grounded in the distinct conceptual traditions of attachment theory and macro-sociology, the ISSI measures two qualitative spheres of human affiliation. Attachment taps intimate, primary bonds necessary for emotional defense in acute life crises, whereas social integration assesses broader sociometric engagement essential for social identity, recreational companionship, and protection against existential anomie.

In epidemiological and psychiatric research, the ISSI has been extensively utilized to test the “stress-buffering hypothesis” versus direct-effect models of social support. It allows investigators to determine whether robust social bonds serve as an immunological buffer against severe life stressors or whether the subjective appraisal of relational adequacy directly dampens neurotic symptoms. In clinical settings, the ISSI serves as a comprehensive diagnostic intake tool, allowing therapists to pinpoint interpersonal vulnerabilities, design targeted marital or interpersonal psychotherapy (IPT) interventions, and evaluate social remediation protocols over longitudinal follow-up periods.

Psychological Construct

The psychological construct evaluated by the ISSI is social interaction conceptualized as a multi-tiered, functional resource. Rather than treating “social support” as a monolithic entity, the ISSI dissects social provisions across a two-by-two factorial matrix defined by domain (Attachment vs. Social Integration) and appraisal mode (Availability vs. Adequacy). This formulation results in four distinct, empirically validated subscales:

1. Availability of Attachment (AVAT)

The AVAT dimension quantifies the objective or nominal accessibility of close, confiding, and emotionally protective relationships. These are primary bonds characterized by profound mutual trust, affectional security, and unconditional psychological safety. Items loading onto AVAT examine whether the respondent has access to specific individuals with whom they can share their most private thoughts, lean upon during traumatic personal emergencies, and turn to for emotional solace when distressed. An individual with elevated AVAT scores reports the tangible presence of at least one intimate confidant (such as a spouse, romantic partner, or lifelong friend) who is available to provide high-order emotional shelter.

2. Adequacy of Attachment (ADAT)

The ADAT dimension measures the respondent’s subjective appraisal of, and psychological satisfaction with, their close emotional attachments. It assesses whether existing attachment relationships fulfill the individual’s internal emotional needs or leave them yearning for greater closeness, more frequent dialogue, or additional attachment figures. Importantly, an individual may possess high AVAT (e.g., being married or living with family) yet score remarkably low on ADAT if they experience interpersonal friction, emotional neglect, or an unfulfilled desire for deeper confiding intimacy. Conversely, a person with a single confidant may demonstrate perfect ADAT if that sole bond completely satisfies their relational requirements.

3. Availability of Social Integration (AVSI)

The AVSI dimension assesses the extent of the individual’s secondary social network, consisting of friends, work colleagues, neighbors, and casual acquaintances. In contrast to the intimate, high-stakes nature of attachment, AVSI addresses broader communal participation: having a circle of peers with whom one shares common interests, engages in casual conversations about everyday events, shares recreation, and experiences collective identity. The focus is on structural network size, interactional frequency, and sociometric embedding within a social ecosystem.

4. Adequacy of Social Integration (ADSI)

The ADSI dimension evaluates the individual’s cognitive and affective contentment with their broader social network. It assesses whether the respondent feels they have sufficient numbers of casual acquaintances, whether they desire more frequent invitations to social gatherings, or whether they perceive their peer integration as adequate for their lifestyle. A deficit in ADSI manifests as subjective loneliness or social alienation, wherein the person longs for a more active social life, more peer group inclusion, or broader communal validation.

Theoretical Framework

The theoretical architecture of the ISSI is situated at the intersection of psychiatric attachment theory and sociological network theory, drawing primarily upon the foundational formulations of John Bowlby and the relational provisions framework of Robert S. Weiss.

John Bowlby’s ethological formulation of attachment posited that human beings possess an innate, evolutionarily hardwired drive to seek proximity to familiar, responsive figures, particularly during periods of threat, illness, or vulnerability. Bowlby maintained that while attachment behavior is most visible in early childhood, it remains biologically active across the entire lifespan. Henderson and colleagues integrated this insight by conceptualizing the confiding relationship not merely as a pleasant social diversion, but as an essential neurobiological buffer that regulates human affect, mitigates neuroendocrine stress responses, and preserves psychological equilibrium.

To differentiate close dyadic bonds from peer groups, the authors synthesized Bowlby’s concepts with Robert S. Weiss’s seminal 1974 taxonomy of “The Provisions of Social Relationships.” Weiss postulated six distinct relational provisions categorized into two broad classes:

• Attachment Provisions: Emotional security and a sense of comfort and safety provided by intimate dyads. The absence of these provisions engenders the “loneliness of emotional isolation,” characterized by subjective apprehension and restlessness.
• Social Integration Provisions: A sense of belonging to a collective, shared concerns, social identity, and companionship provided by peer groups. The absence of these provisions yields the “loneliness of social isolation,” marked by boredom, marginality, and anomie.

Furthermore, the ISSI incorporates cognitive appraisal theory, later formalized by Richard Lazarus and Susan Folkman. The instrument recognizes that the objective environment does not impact psychological health in a simple, mechanistic manner; rather, environmental inputs are filtered through cognitive appraisals of meaning and satisfaction. By designing contingent branching algorithms that contrast actual relational availability against the respondent’s subjective preference (e.g., preferring solitude vs. suffering from an unmet need for a confidant), the ISSI operationalizes social interaction as a dynamic transactional process between individual psychological needs and interpersonal opportunities.

Validity

The ISSI has been subjected to rigorous construct, convergent, discriminant, and predictive psychometric validation in community samples, clinical cohorts, and cross-cultural investigations:

1. Construct and Structural Validity

Construct validity was initially confirmed in Henderson et al.’s (1980, 1981) epidemiological surveys in Canberra, Australia, involving large representative adult populations (N > 750). Intercorrelations among the four primary indices confirmed the theoretical autonomy of the domains. AVAT and AVSI exhibited modest positive correlations (r ≈ .35 to .42), indicating that while individuals with intimate confidants tend to be somewhat more embedded in peer networks, the two domains do not collapse into a single dimension. Furthermore, the correlation between availability and adequacy dimensions within domains was moderate (r ≈ .40 to .55), proving that objective availability is a necessary but insufficient condition for perceived relational adequacy.

2. Convergent Validity

The ISSI scales correlate robustly with established measures of interpersonal functioning and affective state. AVAT and ADAT correlate negatively with validated instruments measuring subjective loneliness, such as the UCLA Loneliness Scale (correlations ranging from -.52 to -.68), and positively with measures of marital quality, perceived dyadic intimacy, and secure attachment styles. The social integration indices (AVSI and ADSI) correlate significantly with social network indices, frequency of voluntary organization involvement, and sociometric density measures.

3. Discriminant and Predictive Validity

The predictive power of the ISSI was demonstrated in longitudinal epidemiological investigations tracking the onset and course of neurotic disorders. Henderson et al. (1981) demonstrated that when controlling for baseline neurotic symptoms, low scores on the Adequacy scales (ADAT and ADSI) significantly predicted subsequent psychological distress, general psychiatric morbidity, and depressive symptomatology as measured by the General Health Questionnaire (GHQ) and the Present State Examination (PSE). Intriguingly, subjective adequacy scales consistently outperformed objective availability scores in predicting vulnerability to neurotic illness following acute negative life events, confirming that cognitive-affective dissatisfaction with social ties is a more potent predictor of affective decompensation than the absolute numerical headcount of social contacts.

Reliability

The reliability of the ISSI has been established across multiple independent studies utilizing various psychometric metrics, including internal consistency, test-retest stability, and inter-rater agreement:

Internal Consistency

Across both general population and clinical samples, the subscales demonstrate acceptable to high internal consistency coefficients (Cronbach’s alpha):

• Availability of Attachment (AVAT): α = .70 – .76
• Adequacy of Attachment (ADAT): α = .72 – .82
• Availability of Social Integration (AVSI): α = .80 – .85
• Adequacy of Social Integration (ADSI): α = .78 – .84

Test-Retest Stability

In stability studies conducted over short-to-medium intervals (ranging from 2 weeks to 4 months) among stable community cohorts, Pearson correlation coefficients remained uniformly robust. Retest reliability was recorded at r = .78 for AVAT, r = .70 for ADAT, r = .81 for AVSI, and r = .74 for ADSI. The slightly lower temporal stability observed for the Adequacy subscales reflects their sensitivity to genuine fluctuations in mood states, situational life crises, and evolving relational dynamics, whereas the Availability indices capture the higher temporal durability of structural networks.

Inter-Rater Reliability

Because the ISSI is an interviewer-administered instrument, inter-rater reliability is critical. In validation trials where independent raters scored audio-recorded interview sessions or observed live branching administrations, inter-rater concordance coefficients exceeded .90 across all composite subscales, confirming the high clarity and standardization of the operational branching rules and scoring algorithms.

Factor Analysis

The factorial validity of the ISSI has been extensively evaluated using both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). In the foundational psychometric evaluations conducted by Henderson, Duncan-Jones, Byrne, and Scott (1980), principal components analysis followed by varimax and oblique rotations consistently yielded an empirical separation congruent with the theoretical 2 × 2 model.

Exploratory Factor Structure

Factor analyses conducted on item correlation matrices revealed that items cleanly coalesce around four primary orthogonal or mildly correlated factors:

• Factor 1: Availability of Social Integration: Highly loaded by items enumerating work colleagues, casual friends, social gatherings, and shared leisure activities (factor loadings ranging from .48 to .78).
• Factor 2: Adequacy of Social Integration: Marked by items capturing the desire for more acquaintances, broader peer acceptance, and dissatisfaction with group involvement (loadings from .45 to .74).
• Factor 3: Availability of Attachment: Defined by items measuring the concrete accessibility of confidants, crisis lean-on figures, and emotionally protective partners (loadings from .52 to .81).
• Factor 4: Adequacy of Attachment: Saturated by items evaluating whether intimate confiding, comfort, and mutual understanding are perceived as sufficient or chronically lacking (loadings from .50 to .79).

Confirmatory Factor Models and Short Forms

Subsequent confirmatory factor analytic studies (e.g., Undén & Orth-Gomér, 1989; McDowell, 2006) examined competing structural formulations, including a single general factor of “social support,” a two-factor model (Attachment vs. Integration), and the hypothesized four-factor model. The four-factor correlated model consistently demonstrated superior model fit indices, exhibiting statistically significant chi-square reductions, high Comparative Fit Index values (CFI > .92), and low Root Mean Square Error of Approximation values (RMSEA < .06). These factor analytic confirmations led to the development of validated abbreviated self-report versions (such as the 30-item or 24-item short forms of the ISSI), which retain identical four-factor dimensionality while reducing respondent burden.

Instrument / Measurement Tool

• Instrument Name: Interview Schedule for Social Interaction (ISSI)
• Original Authors: A. Scott Henderson, Paul Duncan-Jones, D. G. Byrne, and Ruth Scott
• Year of Development: 1980
• Administration Format: Semistructured branching interview; also adaptable to supervised self-report questionnaire formats
• Target Population: Adults (aged 18 and older) in psychiatric epidemiology, community health surveys, and clinical settings
• Item Structure: Full version contains 53 items arranged in linked stems; abbreviated versions contain 24 to 30 items; standard sample battery utilizes core representative probes across primary domains
• Subscale Architecture:
  • Availability of Attachment (AVAT): 8 items in standard full interview
  • Adequacy of Attachment (ADAT): 12 items in standard full interview
  • Availability of Social Integration (AVSI): 16 items in standard full interview
  • Adequacy of Social Integration (ADSI): 17 items in standard full interview
• Response Scale and Branching Architecture: Branching interview format: Dichotomous screening (0 = No, 1 = Yes) followed by satisfaction ratings regarding availability and adequacy of social relationships (e.g., 1 = About right, 2 = Depends on the situation, 3 = More, 4 = Like someone else as well; or 1 = Keep things to yourself, 2 = Like to have someone).
• Scoring Rules:
  • Availability Scores (AVAT, AVSI): Calculated as sum scores reflecting the nominal or numerical presence of specific social ties and activities. Higher scores denote a wider structural social network and the presence of primary attachment figures.
  • Adequacy Scores (ADAT, ADSI): Derived from the branching contingent probes. Responses indicating that the current level of social interaction or support is “about right” receive favorable adequacy points, whereas desires for more support, feelings of lack, or unfulfilled relational needs yield lower adequacy scores. Higher composite adequacy scores reflect optimal satisfaction and the perceived sufficiency of interpersonal relationships.

Permissions & Fee and Test Year

The Interview Schedule for Social Interaction was published in 1980 by A. Scott Henderson, Paul Duncan-Jones, D. G. Byrne, and Ruth Scott under the auspices of the National Health and Medical Research Council (NHMRC) Social Psychiatry Research Unit, Australian National University, Canberra, Australia. The original validation studies and comprehensive scoring manuals were published in Psychological Medicine (Cambridge University Press) and in the monograph Neurosis and the Social Environment (Academic Press, 1981).

The ISSI is considered an open academic research instrument. It may be utilized by clinical researchers, epidemiologists, and mental health professionals for non-commercial scientific and clinical investigations without licensing royalties. Comprehensive descriptions, item inventories, and scoring adaptations have been reproduced in standard psychometric reference compendia, including Ian McDowell’s Measuring Health: A Guide to Rating Scales and Questionnaires (Oxford University Press). Researchers seeking to adapt the interview schedule or administer computerized adaptations are expected to cite the original 1980 and 1981 publications.

References

• 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., 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.
• 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/s0033291700055018
• 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
• Undén, A. L., & Orth-Gomér, K. (1989). Development of a social support questionnaire: Cross-sectional and prospective aspects of its reliability and validity. Social Science & Medicine, 29(1), 83–92. https://doi.org/10.1016/0277-9536(89)90131-4
• Weiss, R. S. (1974). The provisions of social relationships. In Z. Rubin (Ed.), Doing unto others: Joining, conforming, loving, helping (pp. 17–26). Prentice-Hall.

13. Items of the Scale (Questionnaire)