Interpersonal Support Evaluation List (ISEL)

1. Abstract

The Interpersonal Support Evaluation List (ISEL), developed by Sheldon Cohen, Robin Mermelstein, Tom Kamarck, and Harry Hoberman (1985), is one of the most widely cited and psychometrically validated instruments designed to assess the perceived availability of functional social support resources. Recognizing that social support is not a monolithic structural construct but rather a multifaceted functional network capable of attenuating the deleterious effects of life stress, the authors formulated the ISEL to operationalize specific interpersonal provisions. While the general population version contains 40 items, the Interpersonal Support Evaluation List – College Version (ISEL-College) comprises 48 self-report items tailored specifically to the developmental, social, and academic challenges encountered in higher education environments. The instrument measures four distinct functional subscales: Tangible Support (the perceived availability of material, instrumental, or physical aid), Belonging Support (the availability of companions with whom one can socialize and participate in leisure activities), Appraisal Support (the perceived availability of trustworthy confidants with whom one can discuss personal dilemmas and emotional challenges), and Self-Esteem Support (the perceived availability of positive social comparison metrics that bolster personal competence and self-worth).

Respondents evaluate statements using a forced-choice dichotomous format consisting of “probably true” (PT) and “probably false” (PF), calibrated to minimize neutral response styles and ambivalence. Across decades of empirical inquiry, the ISEL and ISEL-College have demonstrated robust psychometric properties, including high internal consistency (Cronbach’s alpha values typically ranging between .77 and .90 for individual subscales and exceeding .88 for the total composite score) and satisfactory test-retest reliability across multi-week and multi-month intervals. Confirmatory factor analyses consistently substantiate the instrument’s multidimensional architecture while affirming a higher-order general social support factor. Crucially, the ISEL served as the primary psychometric foundation for validating the classic stress-buffering hypothesis, demonstrating that perceived functional support buffers against neuroendocrine dysregulation, psychological distress, depressive symptomatology, and somatic illness under conditions of acute and chronic life stress.

2. Keywords

Interpersonal Support Evaluation List, ISEL, social support measurement, perceived social support, stress-buffering hypothesis, tangible support, belonging support, appraisal support, self-esteem support, psychometrics

3. Authors

The Interpersonal Support Evaluation List was conceptualized, developed, and empirically validated by a team of prominent health psychologists and behavioral medicine researchers:

• Sheldon Cohen, Ph.D. – Emeritus University Professor of Psychology at Carnegie Mellon University (CMU), Pittsburgh, Pennsylvania. Dr. Cohen is an internationally recognized authority on stress, social integration, psychoneuroimmunology, and susceptibility to infectious illness.
• Robin Mermelstein, Ph.D. – Distinguished Professor of Psychology and Director of the Institute for Health Research and Policy at the University of Illinois at Chicago (UIC). Her research spans behavioral medicine, addictive behaviors, adolescent health transitions, and longitudinal methodologies.
• Tom Kamarck, Ph.D. – Professor of Psychology and Psychiatry at the University of Pittsburgh. His work emphasizes behavioral medicine, cardiovascular psychophysiology, ecological momentary assessment (EMA), and the physiological pathways linking psychological stress to subclinical cardiovascular disease.
• Harry Hoberman, Ph.D. – Clinical Psychologist and Adjunct Associate Professor in the Department of Psychiatry at the University of Minnesota Medical School. His scholarship focuses on adolescent mental health, depressive disorders, and clinical interventions.

Correspondence regarding the original psychometric development of the ISEL may be referenced through the archival scholarly records of the Department of Psychology at Carnegie Mellon University.

4. Purpose

The primary purpose of the Interpersonal Support Evaluation List (ISEL) is to provide an empirical, standardized measure of perceived functional social support. Prior to the introduction of the ISEL in the mid-1980s, the literature on social support was impeded by significant conceptual confounding. Researchers routinely conflated structural social support (e.g., social network size, marital status, frequency of interpersonal contact, or organizational memberships) with functional social support (the psychological perception that specific helping functions would be fulfilled if needed). Structural indices frequently failed to capture whether existing relationships provided meaningful psychological security or, conversely, represented sources of interpersonal conflict, obligation, or strain. Cohen and colleagues designed the ISEL to systematically evaluate functional provisions, specifically isolating perceived availability rather than merely counting interpersonal contacts.

A second fundamental purpose was to create an assessment tool designed to test the stress-buffering model versus the main-effect model of social relationships. The authors recognized that distinct life stressors generate distinct resource deficits. For example, financial strain demands material intervention, whereas cognitive confusion or decision-making dilemmas require informational and appraisal feedback. The ISEL was deliberately designed with differentiated subscales to determine whether specific functional resources selectively moderate particular classes of life events, or whether perceived support exerts a generalized prophylactic effect irrespective of stress exposure.

In academic, clinical, and epidemiological contexts, the ISEL-College addresses the unique developmental juncture of young adulthood. Matriculation into college typically dismantles established high school and familial support networks, demanding the rapid construction of new social ecosystems. Undergraduates experience heightened academic scrutiny, independent living demands, financial novelties, and interpersonal renegotiations. The ISEL-College enables clinical psychologists, university counselors, and behavioral researchers to:

• Identify matriculating students deficient in essential social capital who are at elevated risk for attrition, adjustment disorders, anxiety, or clinical depression.
• Examine the mechanistic pathways linking interpersonal appraisal deficits to health-compromising behaviors, such as hazardous binge drinking, substance misuse, sleep deprivation, and disordered eating.
• Evaluate the efficacy of institutional campus interventions, peer mentoring programs, and residential life support networks by tracking functional support trajectories over time.
• Facilitate biomedical and psychoneuroimmunological investigations examining how perceived social buffers regulate autonomic, cardiovascular, and hypothalamic-pituitary-adrenal (HPA) axis reactivity during standardized laboratory stress tasks and naturalistic academic examinations.

5. Psychological Construct

The psychological construct measured by the ISEL is perceived functional social support. Unlike received support (which quantifies actual retrospective helping transactions that have already occurred) or network integration (which maps relational ties), perceived functional support captures an individual’s prospective cognitive appraisal that social resources are accessible within their interpersonal environment. Research consistently demonstrates that perceived support is a far more reliable predictor of health and psychological wellbeing than received support, as received support is often confounded with concurrent distress (i.e., individuals receive support precisely because they are undergoing severe crisis).

The ISEL-College operationalizes this construct across four distinct, interrelated theoretical dimensions:

1. Tangible Support

Tangible support (often referred to as instrumental aid) reflects the perceived availability of material, financial, logistical, or physical resources. This dimension assesses whether an individual believes their network would furnish concrete assistance in times of practical deficit. In the college context, this encompasses micro-loans to cover emergency academic or living expenses, help with moving furniture or personal belongings into residential spaces, meal delivery during bouts of acute physical illness, assistance with lecture notes and missed coursework, or access to vehicular transportation. Tangible support directly alleviates practical logistical burdens, thereby truncating the objective severity of a stressor before it overwhelms personal coping capacity.

2. Belonging Support

Belonging support evaluates the perceived availability of individuals with whom one can engage in recreational, leisure, and social activities. This dimension moves beyond mere physical presence to capture true social integration, affiliative security, and companionship. It assesses whether an individual has ready access to peers for spontaneous activities (such as sharing meals, exercising, attending films, or visiting dormitories) and structured group affiliations (such as student clubs, intramural athletics, or religious organizations). Belonging satisfies fundamental evolutionary human needs for attachment and group membership, warding off the insidious psychological hazards of alienation, social isolation, and subjective loneliness.

3. Appraisal Support

Appraisal support (interchangeably termed informational or emotional-evaluative support) denotes the perceived availability of a trusted confidant with whom one can candidly discuss intimate psychological distress, personal quandaries, developmental stressors, and complex decisions. In the college milieu, this dimension targets discussions surrounding academic time management, adjustment to campus culture, parental friction, peer conflict, relational intimacy, sexual concerns, and struggles with depressive feelings or substance use. Appraisal support aids individuals in cognitive reframing, clarifying ambiguous threats, resolving problem-solving impasses, and restoring emotional equilibrium through mutual self-disclosure.

4. Self-Esteem Support

Self-esteem support (frequently conceptualized as esteem support or social comparison support) quantifies the perceived availability of positive social feedback and favorable social comparisons. This subscale measures whether an individual perceives that others hold them in high regard, value their intellectual and relational capabilities, and view them as socially competent and resilient. Uniquely in the ISEL-College, items evaluate how individuals perceive their standing relative to peers regarding academic adjustment, future prospects, intellectual aptitude, and social appeal. Self-esteem support fortifies feelings of personal efficacy, mitigates feelings of inferiority, and cushions the ego against evaluative setbacks.

6. Theoretical Framework

The Interpersonal Support Evaluation List is rooted in Lazarus and Folkman’s Cognitive Phenomenological Theory of Psychological Stress and Coping (1984) and Sheldon Cohen and Thomas Wills’ Stress-Buffering Hypothesis (1985). This theoretical architecture posits that the psychological and physiological impact of an environmental demand is not an unmediated consequence of the objective stressor, but rather the product of a two-stage cognitive appraisal process:

1. Primary Appraisal: The individual evaluates an environmental transaction to determine whether it is irrelevant, benign-positive, or stressful (representing potential harm, loss, or threat).
2. Secondary Appraisal: If an event is appraised as threatening, the individual evaluates their available coping resources to navigate, neutralize, or endure the impending challenge.

Within this framework, perceived social support acts as a formidable cognitive filter at both appraisal junctures. During primary appraisal, the knowledge that others are available to provide support may lead an individual to appraise an objective demand (e.g., an upcoming academic examination or a financial shortfall) as benign or manageable rather than catastrophic, thereby blunting the initial psychological threat response. During secondary appraisal, the perceived accessibility of functional resources alters coping calculations. An individual recognizes that even if personal resources fall short, the surrounding interpersonal network will mobilize compensatory instrumental, informational, or emotional scaffolding.

The Stress-Buffering vs. Main-Effect Models

Cohen and Wills (1985) articulated two distinct conceptual pathways through which social relationships affect psychological wellbeing and physical health:

• The Main-Effect Model: This perspective suggests that social integration exerts a generalized, uniform beneficial effect regardless of whether the individual is confronting acute stress. Being embedded in a cohesive network provides regular positive affect, stable social roles, predictability, and social control over health-damaging impulses. The main-effect model is most strongly tapped by structural network measures and broad feelings of belonging.
• The Stress-Buffering Model: This model asserts that social support primarily functions as a protective shield that intervenes between the occurrence of a stressor and the manifestation of pathological stress reactions (such as clinical depression, neuroendocrine hyperarousal, or immunosuppression). Under low-stress conditions, support differences are largely inconsequential to wellbeing; under high-stress conditions, however, individuals with robust functional support maintain psychological and physiological homeostasis, whereas those lacking support demonstrate precipitous health declines.

The ISEL was engineered specifically to validate the stress-buffering model. By disaggregating functional provisions into tangible, belonging, appraisal, and self-esteem components, the authors enabled empirical tests of the matching hypothesis. The matching hypothesis stipulates that buffering occurs most effectively when the specific functional resource matched by the support domain directly corresponds to the precise coping demands elicited by the stressor. For example, financial deficits require tangible intervention, whereas threats to self-worth require self-esteem affirmation.

7. Validity

The psychometric validity of the ISEL and ISEL-College has been extensively corroborated across diverse experimental, clinical, and community cohorts over four decades of research.

Construct and Convergent Validity

Construct validity is substantiated by robust correlations with external measures of interpersonal functioning, mental health, and personality traits. The ISEL subscales correlate positively and significantly with established social network indices, including the Social Support Questionnaire (SSQ; Sarason et al., 1983) and the Inventory of Socially Supportive Behaviors (ISSB; Barrera et al., 1981). Convergent validity investigations consistently indicate that high ISEL scores correlate inversely with standard measures of psychopathology:

• Significant negative correlations with the Beck Depression Inventory (BDI; $r = -.40$ to $-.60$), the Center for Epidemiologic Studies Depression Scale (CES-D), and the Profile of Mood States (POMS).
• Marked negative associations with the UCLA Loneliness Scale ($r = -.55$ to $-.72$), with the Belonging and Appraisal subscales demonstrating particularly strong negative associations.
• Moderate positive correlations with generalized self-efficacy, optimism (as measured by the Life Orientation Test-Revised), and perceived emotional intelligence.

Discriminant Validity

Discriminant validity is critical to confirm that the ISEL measures distinct interpersonal perceptions rather than merely reflecting generalized neuroticism, negative affectivity, or socially desirable responding. Studies administering the Marlowe-Crowne Social Desirability Scale have documented weak, statistically negligible correlations with ISEL subscales ($r < .18$), confirming that scores are not an artifact of impression management. Furthermore, while the ISEL shares variance with trait neuroticism (as measured by the Eysenck Personality Questionnaire or NEO-PI-R), structural equation modeling demonstrates that perceived support accounts for significant unique variance in psychological distress even after statistically partialing out neuroticism and baseline negative affectivity.

Predictive and Stress-Buffering Validity

The predictive validity of the ISEL has been documented through longitudinal prospective studies and physiological stress paradigms. Cohen, Mermelstein, Kamarck, and Hoberman (1985) demonstrated that in the presence of elevated life event stress, students scoring low on the ISEL exhibited marked elevations in depressive symptomatology and somatic complaints, whereas students with high ISEL scores showed virtually flat symptom slopes across stress gradients, providing empirical evidence for the stress-buffering interaction. In psychoneuroimmunological studies, low ISEL scores have predicted greater biological vulnerability, including elevated ambulatory blood pressure, dysregulated diurnal cortisol slopes, blunted natural killer (NK) cell cytotoxicity, and heightened susceptibility to experimentally introduced rhinovirus challenges.

8. Reliability

The ISEL-College demonstrates high internal consistency and temporal stability across clinical and non-clinical collegiate populations.

Internal Consistency

Internal consistency estimates (Cronbach’s coefficient alpha) across the 48-item college inventory consistently meet and exceed rigorous psychometric standards for behavioral research:

• Total ISEL-College Score: $\alpha = .88$ to $.92$, reflecting exceptional overall composite reliability.
• Tangible Support Subscale: $\alpha = .77$ to $.82$.
• Belonging Support Subscale: $\alpha = .75$ to $.81$.
• Appraisal Support Subscale: $\alpha = .79$ to $.86$.
• Self-Esteem Support Subscale: $\alpha = .71$ to $.78$.

The slightly lower alpha coefficient observed for the Self-Esteem subscale in some collegiate samples has been attributed to its broader social comparison orientation, which encompasses both academic and social domains. Nevertheless, all subscales consistently surpass Nunnally’s standard threshold ($lpha ge .70$) for basic research applications.

Test-Retest Stability

Test-retest reliability evaluations confirm that the ISEL captures a stable cognitive appraisal style over moderate intervals, while maintaining adequate sensitivity to genuine environmental transitions:

• Across a two-day interval, test-retest correlations for the subscales ranged from $.80$ to $.90$, with the total score demonstrating stability exceeding $r = .90$.
• Across a six-week testing interval, Cohen et al. (1985) reported stability coefficients of $r = .74$ for Total Support, $r = .73$ for Tangible, $r = .73$ for Belonging, $r = .78$ for Appraisal, and $r = .60$ for Self-Esteem.
• Across a six-month interval, coefficients attenuate moderately ($r = .55$ to $.68$), an expected outcome in college cohorts who undergo substantial roommate relocations, academic term completions, and changes in peer networks.

9. Factor Analysis

The structural dimensionality of the ISEL has been evaluated using both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) across numerous independent samples.

Exploratory Factor Structure

During initial scale development, Cohen and colleagues utilized principal components analysis with varimax and oblimin rotations. Items were constructed such that each of the four subscales (12 items each in the college version) contained an equal balance of positive (support-affirming) and negative (support-deficient) statements to mitigate acquiescence response set bias. Factor solutions revealed that while items broadly loaded onto their hypothesized functional dimensions, moderate-to-high inter-factor correlations (typically ranging between $r = .35$ and $.65$) emerged, indicating that perceived support dimensions are intercorrelated components of a broader social capital construct.

Confirmatory Factor Structure

Contemporary psychometric evaluations employing CFA have systematically tested competing structural models:

1. Unidimensional Model: All 48 items loading onto a single global support factor. This model yields consistently poor fit indices ($\chi^2/ ext{df} > 3.8$, $ ext{CFI} < .80$,$ ext{RMSEA} > .08$).
2. Four-Factor Oblique Model: Four distinct, correlated latent factors (Tangible, Belonging, Appraisal, Self-Esteem). This model demonstrates vastly superior fit ($ ext{CFI} ge .91$,$ ext{TLI} ge .90$,$ ext{RMSEA} le .054$,$ ext{SRMR} le .052$).
3. Higher-Order Hierarchical (Bifactor) Model: Four specific first-order functional factors nested under an overarching second-order “General Perceived Social Support” latent dimension. This specification typically yields optimal fit statistics, accounting for shared variance among the subscales while validating the practice of calculating both discrete subscale scores and an omnibus composite score.

Item Loadings and Methodological Method Effects

Confirmatory analyses frequently detect an underlying method effect associated with item phrasing directionality. When method factors (i.e., separate latent factors for reverse-worded items) are explicitly modeled, the distinctiveness of the four substantive functional dimensions becomes even clearer, with standardized factor loadings across individual items consistently ranging between $.45$ and $.78$. In particular, the Belonging and Appraisal subscales demonstrate distinct structural paths when predicting mental health outcomes, disconfirming suggestions that companionship and emotional confiding are psychometrically interchangeable.

10. Instrument / Measurement Tool

• Instrument Name: Interpersonal Support Evaluation List – College Version (ISEL-College)
• Original Scale Name: Interpersonal Support Evaluation List (ISEL)
• Test Type: Standardized self-report psychometric rating inventory
• Target Population: Undergraduate college and university students, emerging adults
• Administration Format: Paper-and-pencil, computer-assisted, or secure web-based survey administration
• Completion Time: Approximately 10 to 15 minutes
• Item Count: 48 items total, organized into four balanced functional subscales of 12 items each:
• Tangible Support: 12 items
• Belonging Support: 12 items
• Appraisal Support: 12 items
• Self-Esteem Support: 12 items
• Response Format: Forced-choice dichotomous response format:
  • Probably True (PT)
  • Probably False (PF)
• Scoring and Directionality Rules:
  • In the research protocol, items from all four subscales are intermixed and presented in a counterbalanced or randomized sequence.
  • Within each 12-item subscale, the first 6 items are keyed positively (a “Probably True” response indicates perceived support availability), whereas the second 6 items (items 7 through 12) are reverse-keyed (a “Probably False” response indicates perceived support availability).
  • Direct-scored items (1–6 of each subscale): Probably True = 1 point, Probably False = 0 points.
  • Reverse-scored items (7–12 of each subscale): Probably False = 1 point, Probably True = 0 points.
  • Subscale Scores: Summed across the 12 items within each subscale, yielding a range from 0 to 12. Higher scores indicate greater perceived availability of that specific functional support resource.
  • Total ISEL Score: Summed across all 48 items, yielding a composite score ranging from 0 to 48.

11. Permissions & Fee and Test Year

• Year of Initial Publication: 1985 (book chapter); initial laboratory drafts circulated 1983.
• Copyright & Ownership: Sheldon Cohen, Ph.D., and co-authors (Robin Mermelstein, Tom Kamarck, Harry Hoberman).
• Access and Usage Fee: The Interpersonal Support Evaluation List (including the College Version, the 40-item General Population Version, and the 12-item Short Form ISEL-12) is made openly available for academic, scientific, non-commercial research and educational clinical use without financial charge or royalty fees.
• Permissions Protocol: Formal permission is generally not required for non-profit academic research, provided that full scholarly attribution is accorded to Dr. Sheldon Cohen and co-authors in any subsequent theses, presentations, or peer-reviewed journal articles. Modifying scale items or embedding the instrument into commercial software platforms, fee-for-service diagnostic batteries, or commercial applications requires written consent from the primary author.
• Institutional Repository: Official scale copies, scoring manuals, and psychometric documentation are hosted via Dr. Sheldon Cohen’s academic laboratory portal at Carnegie Mellon University (Department of Psychology, Carnegie Mellon University).

12. References

• Barrera, M., Sandler, I. N., & Ramsay, T. B. (1981). Preliminary development of a scale of social support: Studies on college students. American Journal of Community Psychology, 9(4), 435–447. https://doi.org/10.1007/BF00918174
• Cohen, S., Mermelstein, R., Kamarck, T., & Hoberman, H. M. (1985). Measuring the functional components of social support. In I. G. Sarason & B. R. Sarason (Eds.), Social support: Theory, research and application (pp. 73–94). Martinus Nijhoff Publishers. https://doi.org/10.1007/978-94-009-5115-0_5
• Cohen, S., & Wills, T. A. (1985). Stress, social support, and the buffering hypothesis. Psychological Bulletin, 98(2), 310–357. https://doi.org/10.1037/0033-2909.98.2.310
• Lazarus, R. S., & Folkman, S. (1984). Stress, appraisal, and coping. Springer Publishing Company.
• Sarason, I. G., Levine, H. M., Basham, R. B., & Sarason, B. R. (1983). Assessing social support: The Social Support Questionnaire. Journal of Personality and Social Psychology, 44(1), 127–139. https://doi.org/10.1037/0022-3514.44.1.127

13. Items of the Scale (Questionnaire)