1. Abstract
The Interpersonal Support Evaluation List (ISEL) — General Population version is a prominent 40-item psychometric instrument developed by Sheldon Cohen and colleagues (1983, 1985) designed to assess the perceived availability of distinct functional components of social support. Unlike structural measures that simply quantify social network size or frequency of interpersonal contact, the ISEL is grounded in functional social support theory and was engineered specifically to evaluate the stress-buffering hypothesis. The instrument operationalizes perceived social resources across four distinct 10-item subscales: Appraisal Support (perceived availability of someone to talk to about one’s personal difficulties and offer advice), Tangible Support (perceived availability of practical, instrumental, or material aid), Self-Esteem Support (perceived availability of positive social comparison and validation of personal worth), and Belonging Support (perceived availability of companions for shared social and recreational activities).
Respondents evaluate 40 balanced statements—comprising 20 positively phrased and 20 negatively phrased items—using a four-point forced-choice Likert-type response scale ranging from definitely false (0) to definitely true (3), with reverse scoring applied to all negative statements to yield subscale totals (0–30) and an overall composite support score (0–120). Psychometric evaluations across broad community, clinical, and occupational samples have consistently demonstrated sound internal consistency, with total score Cronbach’s alpha coefficients regularly falling between .88 and .92, and subscale reliabilities ranging from .70 to .87. Test-retest reliability across multi-month intervals demonstrates robust stability (r = .70–.87). Exploratory and confirmatory factor analyses generally substantiate the four-factor multidimensional structure, while also accommodating a higher-order overarching global support dimension. Construct, convergent, and predictive validities have been confirmed via significant inverse relationships with psychological distress, depressive symptomatology, neuroendocrine reactivity, and somatic morbidity, alongside positive associations with psychological resilience, adaptive coping, and life satisfaction.
2. Keywords
Interpersonal Support Evaluation List, ISEL, perceived social support, stress-buffering hypothesis, appraisal support, tangible support, self-esteem support, belonging support, psychometrics, health psychology
3. Authors
The Interpersonal Support Evaluation List (ISEL) and its underlying functional assessment framework were conceptualized, operationalized, and psychometrically validated by a research collaborative led by Sheldon Cohen, Ph.D., Robert E. Doherty University Professor of Psychology Emeritus at Carnegie Mellon University, along with key co-investigators:
- Sheldon Cohen, Ph.D. — Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States.
- Harry M. Hoberman, Ph.D. — Departments of Psychiatry and Psychology, University of Minnesota Medical School, Minneapolis, Minnesota, United States.
- Robin Mermelstein, Ph.D. — Institute for Health Research and Policy, Department of Psychology, University of Illinois Chicago, Chicago, Illinois, United States.
- Tom Kamarck, Ph.D. — Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.
Inquiries regarding the theoretical development of the scale, comparative normative databases, and the Laboratory for the Study of Stress, Immunity, and Disease can be directed to Carnegie Mellon University’s Department of Psychology.
4. Purpose
The primary purpose of the Interpersonal Support Evaluation List (ISEL) — General Population version is to provide a rigorous, theoretically grounded measure of an individual’s perceived availability of functional social support resources. Developed during a pivotal transition in social epidemiology and health psychology, the scale was created to address widespread methodological limitations in existing social support metrics, which routinely conflated structural social networks (e.g., marital status, organizational affiliations, or network density) with functional psychosocial processes (e.g., receiving emotional solace, material assistance, or cognitive reappraisal during crises).
From an applied research perspective, the ISEL was formulated to test the stress-buffering model—the proposition that social resources operate as protective mechanisms primarily or exclusively under conditions of elevated environmental demands, stress, or psychological threat. By disaggregating functional support into appraisal, tangible, self-esteem, and belonging facets, the ISEL allows researchers to assess domain-specific matching hypotheses, wherein specific types of stress (e.g., financial strain vs. bereavement) require corresponding types of support resources (e.g., tangible assistance vs. appraisal/emotional reassurance) to effectively neutralize allostatic overload and physiological deregulation.
In clinical, psychiatric, and behavioral medicine domains, the ISEL serves as a diagnostic and evaluative tool for mapping interpersonal vulnerabilities and social capital. It enables clinicians and behavioral health researchers to:
- Identify specific resource deficits in vulnerable populations, such as individuals undergoing major life transitions, medical diagnoses (e.g., cardiovascular disease, cancer, chronic pain), or psychiatric rehabilitation for mood and anxiety disorders.
- Assess the mediating and moderating roles of interpersonal factors in treatment adherence, psychotherapy outcomes, and long-term somatic prognosis.
- Evaluate the efficacy of psychosocial interventions, support group programs, and community-based public health initiatives designed to bolster social coping resources.
5. Psychological Construct
The psychological construct assessed by the ISEL is perceived functional social support, conceptualized as an individual’s subjective cognitive appraisal regarding the accessibility and adequacy of support provisions embedded within their interpersonal network. Rather than assessing received support—which is frequently confounded with the actual severity of life stressors that elicit support transactions—perceived support functions as a stable generalized expectation that appropriate assistance will be forthcoming if required. The General Population version of the ISEL operationalizes this construct across four distinct, theoretically derived subdomains, each containing 10 balanced items:
Appraisal Support
Appraisal Support reflects the perceived availability of confidants with whom one can discuss personal difficulties, emotional turmoil, and complex life dilemmas, and who can provide guidance, constructive feedback, or objective insight. This dimension is rooted in cognitive appraisal processes (Lazarus & Folkman, 1984), assisting individuals in reframing stressors, evaluating alternative coping options, and resolving cognitive uncertainty. Scale items measuring appraisal support include assertions regarding the availability of trustworthy advisors (e.g., “There are several people that I trust to help solve my problems”) alongside the absence of such confidants (e.g., “There is no one that I feel comfortable talking about intimate personal problems”).
Tangible Support
Tangible Support (also termed instrumental or practical support) denotes the perceived availability of direct, material aid, physical assistance, and concrete services. This includes financial support during emergencies, help with mechanical repairs, transportation assistance, shelter, and caretaking during periods of physical illness. Tangible resources mitigate stress by directly altering the physical environment or directly removing objective barriers. Prototypic items operationalizing this dimension include: “If I needed an emergency loan of $100, there is someone (friend, relative, or acquaintance) I could get it from” and “If I were sick, I could easily find someone to help me with my daily chores.”
Self-Esteem Support
Self-Esteem Support (frequently referred to as esteem support or positive social comparison) evaluates the perceived availability of relational affirmation that bolsters one’s sense of self-worth, competence, and personal efficacy. Grounded in social comparison theory (Festinger, 1954), this facet gauges the degree to which an individual feels valued, respected, and competent relative to their peers. It captures both direct affirmation from others and positive self-evaluations made within one’s social milieu. Illustrative items include: “There is someone who takes pride in my accomplishments” and “In general, people do not have much confidence in me” (reversed).
Belonging Support
Belonging Support assesses the perceived availability of individuals with whom one can engage in shared recreational activities, social pastimes, and leisurely interaction. Belonging meets fundamental evolutionary and psychological needs for affiliation, social integration, and group membership, providing companionship that distracts from acute stressors and counteracts isolation. Items indexing this dimension include: “If I decide one afternoon that I would like to go to a movie that evening, I could easily find someone to go with me” and “I feel like I’m not always included by my circle of friends” (reversed).
6. Theoretical Framework
The construction of the ISEL emerged directly from the theoretical integration of the Stress-Buffering Hypothesis and Cognitive Appraisal Theory. Prior to Cohen and colleagues’ formulations, the social epidemiology literature was divided between two competing paradigms: the main-effect model (which posits that social networks exert beneficial psychological and physiological effects universally, irrespective of stress levels) and the buffering model (which posits that social support acts primarily as a protective shield that buffers individuals from the pathogenic consequences of acute or chronic stress).
Cohen and Wills (1985) demonstrated that whether one observes main effects or buffering effects depends heavily on the conceptualization and measurement of social support. Structural measures (e.g., marital status, network size) typically yield main effects, whereas measures of specific functional support resources—such as those assessed by the ISEL—consistently demonstrate stress-buffering interactions. According to Cohen’s framework, functional social support intervenes at two primary junctures along the causal chain linking environmental stressors to psychological and somatic pathology:
- Primary Appraisal Interposition: The perception that resources are available alters the primary appraisal of potential stressors. An event that might otherwise be perceived as threatening or overwhelming is appraised as manageable because the individual anticipates that tangible, informational, or belonging resources will be mobilized to meet the environmental demand.
- Secondary Appraisal and Reappraisal Modulation: Functional support resources intervene between the experience of stress and the onset of pathological outcomes (e.g., neuroendocrine hyperarousal, immunosuppression, depression, maladaptive coping). Appraisal support aids in behavioral problem-solving and cognitive reappraisal; tangible aid eliminates practical obstacles; self-esteem support preserves emotional stability and self-efficacy; and belonging support alleviates depressive rumination and isolation.
To maximize psychometric independence among these theoretical functions, Cohen et al. selected items during instrument development that correlated strongly with their intended functional domain while exhibiting minimal empirical cross-loadings onto alternative subscales, thereby operationalizing four distinct components of social resource appraisal.
7. Validity
The construct, convergent, discriminant, and predictive validity of the ISEL has been evaluated across hundreds of empirical investigations in psychological, epidemiological, and medical research.
Construct and Factorial Validity
Extensive factor analyses corroborate the four-component construct. Items load substantially on their designated dimensions (Appraisal, Tangible, Self-Esteem, Belonging), demonstrating strong convergent validity within subscales and acceptable discriminant validity across them. Inter-subscale correlations typically fall within the moderate range (r = .35 to .60), indicating that while the dimensions share common variance attributable to a global perceived support factor, each functional subscale retains significant unique variance.
Convergent Validity
The ISEL demonstrates strong positive convergent validity when correlated with alternative validated measures of social relations, including the Social Support Questionnaire (SSQ; Sarason et al., 1983), the Duke-UNC Functional Social Support Questionnaire, and the Multidimensional Scale of Perceived Social Support (MSPSS). Concurrent validity is further demonstrated by strong negative correlations with validated indices of loneliness (UCLA Loneliness Scale; r typically between -.55 and -.70), perceived stress (Perceived Stress Scale [PSS]; r = -.40 to -.55), and depressive symptomatology (Center for Epidemiologic Studies Depression Scale [CES-D]; r = -.35 to -.50).
Discriminant Validity
Discriminant validity analyses confirm that the ISEL measures constructs distinct from social network size, social desirability, and basic personality traits. Correlations between ISEL subscales and structural network measures (such as the Social Network Index) are moderate to low (r = .20 to .35), confirming that perceived availability of functional resources is phenomenologically distinct from mere social integration or network quantity. Furthermore, correlations with the Marlowe-Crowne Social Desirability Scale remain consistently low (r < .20), demonstrating that responses are not simply reflections of defensive self-enhancement.
Predictive and Criterion Validity
The ISEL has repeatedly demonstrated strong predictive validity across behavioral medicine and psychiatric epidemiology. In stress-buffering paradigms, the ISEL significantly moderates the relationship between major life events and adverse health outcomes, including psychological distress, upper respiratory viral susceptibility, cardiovascular reactivity, and immune dysregulation (Cohen et al., 1985; Cohen & Herbert, 1996). Longitudinal studies have shown that lower baseline ISEL scores reliably predict subsequent elevations in depressive symptoms, prolonged illness recovery trajectories, and elevated systemic inflammation (e.g., C-reactive protein, interleukin-6).
8. Reliability
The psychometric reliability of the ISEL — General Population version has been established across community, occupational, student, and clinical cohorts.
Internal Consistency
Internal consistency estimates (Cronbach’s alpha) for the overall 40-item scale consistently fall between .88 and .92, indicating high internal coherence. Across the four 10-item subscales, internal consistencies generally meet or exceed recommended psychometric thresholds for research instruments:
- Appraisal Support: α = .77 to .84
- Tangible Support: α = .71 to .81
- Self-Esteem Support: α = .68 to .77
- Belonging Support: α = .73 to .78
Because items were explicitly selected to minimize overlap between subscales, internal consistency coefficients for individual subscales are moderately constrained, reflecting the deliberate breadth of behavioral scenarios sampled within each domain.
Test-Retest Reliability
Temporal stability evaluations demonstrate that perceived functional social support, as assessed by the ISEL, functions as a relatively stable psychological attribute while remaining sensitive to genuine shifts in life circumstances. Test-retest reliability across a 2-day to 6-week interval yields stability coefficients ranging from r = .77 to .87 for the overall composite score, and from r = .67 to .84 for the four subscales. Over extended periods of six months to one year, test-retest coefficients remain moderate to high (r = .60 to .74), demonstrating suitable temporal stability for longitudinal and epidemiological cohort studies.
9. Factor Analysis
The latent structure of the 40-item ISEL has been evaluated using both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA).
Exploratory Factor Analyses
In the original scale construction phases conducted by Cohen and colleagues, initial item pools were subjected to principal components and common factor analyses with orthogonal (Varimax) and oblique (Promax) rotations. Items were retained only if they exhibited salient primary loadings (typically > .45) on their designated target factor (Appraisal, Tangible, Self-Esteem, or Belonging) and negligible secondary cross-loadings (< .25) on alternative factors. This analytical approach ensured maximum subscale differentiation despite the shared thematic context of interpersonal relationships.
Confirmatory Factor Analyses
Subsequent confirmatory investigations across diverse populations have systematically tested several competing structural models:
- Unidimensional Model: A single global social support factor. Fit indices for this model are consistently poor (RMSEA > .08, CFI < .80), indicating that perceived social support cannot be reduced to a solitary undifferentiated construct.
- Four-Factor Correlated Model: Four distinct, correlated latent factors corresponding to Appraisal, Tangible, Self-Esteem, and Belonging. This model provides a substantially superior fit to the data across community and clinical samples (CFI > .90, TLI > .89, RMSEA ≈ .045 to .055), confirming the theoretical dimensionality established by Cohen et al.
- Bifactor / Higher-Order Model: A general perceived social support factor that accounts for the common variance across all 40 items, coupled with four orthogonal specific factors capturing domain-specific variance. The bifactor structure frequently yields the highest statistical fit indices, confirming that calculating both a total overall support score and four distinct subscale scores is psychometrically justified.
10. Instrument / Measurement Tool
- Instrument Name: Interpersonal Support Evaluation List (ISEL) — General Population (40-Item Version)
- Instrument Type: Self-report psychological questionnaire / psychometric assessment tool
- Target Population: Adults and general community populations (a specialized 48-item college-student version also exists)
- Number of Items: 40 statements (20 positively stated, 20 negatively stated)
- Response Format: Four-point forced-choice Likert-type response scale:
- Definitely True (3)
- Probably True (2)
- Probably False (1)
- Definitely False (0)
- Subscale Allocation (10 items each):
- Appraisal Subscale (10 items): Items 1, 6, 11, 17, 19, 22, 26, 30, 36, 38
- Tangible Subscale (10 items): Items 2, 9, 14, 16, 18, 23, 29, 33, 35, 39
- Self-Esteem Subscale (10 items): Items 3, 4, 8, 13, 20, 24, 28, 32, 37, 40
- Belonging Subscale (10 items): Items 5, 7, 10, 12, 15, 21, 25, 27, 31, 34
- Reverse-Coded Items (20 items): Items 3, 6, 9, 10, 11, 13, 14, 15, 17, 24, 25, 27, 28, 29, 30, 34, 35, 36, 39, 40.
- For positively phrased items: Definitely False = 0, Probably False = 1, Probably True = 2, Definitely True = 3.
- For reverse-coded items: Definitely True = 0, Probably True = 1, Probably False = 2, Definitely False = 3.
- Scoring and Interpretation:
- Subscale Scores: Summed after reversing negative items; range from 0 to 30 per subscale. Higher scores reflect greater perceived availability of that specific functional support resource.
- Overall Composite Score: Sum of all 40 items; ranges from 0 to 120. Higher scores represent higher overall perceived social support.
11. Permissions & Fee and Test Year
The Interpersonal Support Evaluation List (ISEL) was developed in 1983 (with initial empirical publication by Cohen & Hoberman, 1983) and further elaborated in 1985 (Cohen, Mermelstein, Kamarck, & Hoberman, 1985). The instrument was placed into the public domain for academic, clinical, non-commercial, and scientific research purposes by the authors. No licensing fees or formal commercial royalties are required to use, administer, or score the instrument for non-profit scientific investigation.
Researchers utilizing the scale are expected to cite the foundational validation articles in all resulting publications and maintain item wording integrity to preserve psychometric comparability across the literature. Information regarding the ISEL and related stress instruments is maintained by the Laboratory for the Study of Stress, Immunity, and Disease at Carnegie Mellon University.
12. References
- Cohen, S., & Herbert, T. B. (1996). Health psychology: Psychological factors and physical disease from the perspective of human psychoneuroimmunology. Annual Review of Psychology, 47(1), 113–142. https://doi.org/10.1146/annurev.psych.47.1.113
- Cohen, S., & Hoberman, H. M. (1983). Positive events and social supports as buffers of life change stress. Journal of Applied Social Psychology, 13(2), 99–125. https://doi.org/10.1111/j.1559-1816.1983.tb02325.x
- 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 applications (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
- Festinger, L. (1954). A theory of social comparison processes. Human Relations, 7(2), 117–140. https://doi.org/10.1177/001872675400700202
- 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