Significant Others Scale (SOS)

Abstract

The Significant Others Scale (SOS) is an established psychometric instrument designed by Michael J. Power, L. A. Champion, and S. J. Aris (1988) to assess multi-dimensional perceptions of social support within individualized interpersonal networks. Unlike global support inventories that assess aggregated societal or community support, the SOS evaluates functional support derived from specific, nominated significant others (such as a spouse, close relative, or friend). The instrument comprises 10 core functional items reflecting two distinct theoretical dimensions: Emotional Support (confiding, leaning on in difficulty, self-esteem enhancement, physical comfort, and conflict resolution) and Practical Support (material/financial assistance, advice, social interaction, emergency aid, and shared leisure). A distinctive methodological feature of the SOS is its dual-rating paradigm: respondents assess both the Actual support received or available (“To what extent can you…”) and their Ideal support expectation (“To what extent would you like to be able to…”) on a 7-point Likert scale ranging from 1 (never) to 7 (always). This architecture permits the calculation of discrepancy scores that operationalize interpersonal support deficits. Psychometric evaluations across clinical, psychiatric, and community cohorts confirm high internal consistency (Cronbach’s α typically ranging from .82 to .94 for subscales), robust test-retest reliability across multi-month intervals (r = .73 to .87), and stable two-factor structural validity. The scale demonstrates robust convergent and divergent validity with measures of affective disturbance, psychological distress, and psychological resilience, serving as a vital instrument in clinical psychology, psychosomatic medicine, and social epidemiology.

Keywords

Significant Others Scale, social support, emotional support, practical support, interpersonal relationships, psychometrics, depression, perceived social support, discrepancy analysis, coping

Authors

The Significant Others Scale was conceptualized, operationalized, and psychometrically standardized by:

• Michael J. Power, Ph.D. — Department of Psychiatry, Royal Edinburgh Hospital, University of Edinburgh, Scotland, and later Professor of Clinical Psychology at the National University of Singapore.
• L. A. Champion, Ph.D. — Medical Research Council (MRC) Social Psychiatry Unit, Institute of Psychiatry, King’s College London, United Kingdom.
• S. J. Aris, M.Sc. — MRC Social Psychiatry Unit, Institute of Psychiatry, London, United Kingdom.

Subsequent psychometric developments, theoretical integrations within cognitive-interpersonal models of affective disorders, and short-form adaptations were co-authored by L. A. Champion and M. J. Power through the Institute of Psychiatry and the University of London.

Purpose

The primary purpose of the Significant Others Scale is to provide a granular, person-specific assessment of functional social support rather than a non-specific, global index of social integration. In traditional psychometric literature, social support assessments frequently conflated structural aspects of networks (e.g., marital status, frequency of social contacts) with functional aspects (e.g., the actual psychological or instrumental resources exchanged). Furthermore, early instruments often aggregated support across all potential sources into a single composite score, obscuring interpersonal dynamics where an individual might receive exceptional practical help from a parent but experience profound emotional alienation from a spouse.

The SOS addresses these psychometric limitations by fulfilling three primary clinical and empirical objectives:

• Person-Specific Network Mapping: The scale enables respondents to nominate up to four to six specific significant figures in their subjective social world (e.g., spouse/partner, mother, father, sibling, closest friend, work colleague). Each target person is evaluated independently across the identical set of 10 functional support domains, allowing clinicians and researchers to construct a profile of an individual’s relational environment.
• Dual-Paradigm Discrepancy Measurement: Grounded in cognitive discrepancy models of psychological distress, the SOS captures both Actual support (experienced reality) and Ideal support (cognitive-affective aspiration). Subtracting the Actual score from the Ideal score produces an interpersonal discrepancy metric. Theoretical and empirical evidence demonstrates that an elevated discrepancy score — representing unfulfilled interpersonal expectations — is often a more potent predictor of major depressive disorder and psychological morbidity than absolute low support alone.
• Bifactor Functional Categorization: The instrument cleanly delineates between emotional provisions (nurturance, validation, psychological safety) and practical provisions (tangible aid, guidance, emergency assistance). This distinction is critical in healthcare and psychotherapy settings to identify whether a patient suffers from instrumental deficits (e.g., poverty of physical resources or emergency aid) or emotional deficits (e.g., lack of confiding relationships or intimacy), each requiring distinct therapeutic interventions.

In clinical practice, the SOS is deployed to evaluate vulnerability to depressive relapse, monitor interpersonal adjustments in family therapy and interpersonal psychotherapy (IPT), and assess the psychosocial adjustment of individuals recovering from neurological trauma, chronic physical illness, or severe life crises.

Psychological Construct

The psychological construct evaluated by the SOS is perceived functional social support, conceptualized as a multi-layered, cognitive appraisal of interpersonal resource availability across differentiated social ties. Within the SOS framework, this construct is decomposed into two foundational dimensions, each evaluated at both descriptive (actual) and prescriptive (ideal) cognitive levels:

1. Emotional Support

Emotional support reflects the perception that one is cared for, esteemed, validated, and psychologically secure within a dyadic relationship. Within the SOS, this dimension operationalizes five core relational functions:

• Confiding and Trust (Item 1): The psychological freedom to self-disclose vulnerable emotional material, personal secrets, and distressing thoughts without fear of rejection, mockery, or betrayal.
• Attachment Security and Reliance (Item 2): The degree to which a nominated other serves as a psychological “safe haven” and dependable anchor during acute distress or life destabilization.
• Self-Esteem Bolstering and Validation (Item 3): The receipt of unconditional positive regard, interest, and communicative reinforcement that enhances the respondent’s sense of self-worth and self-efficacy.
• Physical Comfort (Item 4): The availability of non-verbal, physical affection, warmth, and soothing (e.g., hugs, holding hands, physical proximity) that down-regulates autonomic nervous system arousal during stress.
• Dyadic Conflict Resolution (Item 5): The interpersonal resilience of the relationship, specifically the mutual capacity to navigate, negotiate, and repair interpersonal ruptures and disagreements without relational dissolution.

2. Practical Support

Practical (or instrumental) support involves the cognitive appraisal of direct tangible assistance, cognitive-behavioral guidance, and shared social activity. The SOS measures five operational facets within this dimension:

• Material and Financial Aid (Item 6): Direct instrumental intervention, such as loaning money, assisting with housing, or providing tangible physical goods during hardship.
• Informational Support and Guidance (Item 7): The provision of constructive cognitive reframing, practical advice, problem-solving suggestions, and behavioral feedback.
• Sociability and Social Integration (Item 8): Predictable, routine opportunities for physical interaction, shared companionship, and leisure visits.
• Crisis / Emergency Mobilization (Item 9): The perceived certainty that the nominated individual would respond immediately with action if an acute, unexpected crisis (e.g., medical emergency, accident) were to occur.
• Shared Positive Affect and Recreation (Item 10): The collaborative engagement in play, mutual hobbies, relaxation, and shared humor, which facilitates the generation of positive affect and buffers against chronic stress.

Theoretical Framework

The Significant Others Scale is theoretically anchored at the intersection of three major psychological paradigms: the stress-buffering hypothesis of social support (Cohen & Wills, 1985), attachment theory (Bowlby, 1969, 1980), and the cognitive vulnerability-stress models of affective disorders (Beck, 1976; Champion & Power, 1995).

The Stress-Buffering Hypothesis vs. Direct Effects

Psychosocial epidemiology differentiates between the “main effect” model (which posits that social integration is globally beneficial regardless of environmental stress) and the “buffering model” (which posits that social support acts as an interactive shield against the pathogenic influence of acute and chronic life stressors). Power, Champion, and Aris (1988) formulated the SOS primarily under the buffering framework. They postulated that individuals facing severe life events do not break down into clinical depression merely because of the event itself, but because of an absence of specific, high-quality functional resources (primarily a confiding, emotionally supportive significant other) that can mitigate catastrophic cognitive appraisals.

Attachment and the “Primary Confidant” Phenomenon

Drawing on John Bowlby’s attachment theory and the pioneering epidemiological investigations of George Brown and Tirril Harris (1978) on the social origins of depression, the SOS emphasizes that not all social ties are created equal. Brown and Harris demonstrated that the presence of an intimate, confiding partner (a “Tier 1” attachment figure) provided profound protection against female depression in the face of severe adversity, whereas casual acquaintances or secondary social networks offered negligible buffering. By requiring respondents to identify specific “significant others” by role and name, the SOS operationalizes the internal working models of attachment figures as perceived providers of a secure base and safe haven.

Cognitive Discrepancy Theory

A central theoretical innovation of the SOS is its integration with cognitive discrepancy formulations, such as E. Tory Higgins’ self-discrepancy theory (1987). Champion and Power (1995) proposed that affective pathology arises from perceived mismatches between an individual’s actual interpersonal reality and their idealized interpersonal expectations. When a respondent experiences an elevated gap between actual support received and ideal support desired from a central figure (e.g., desiring deep emotional intimacy from a partner who remains emotionally aloof), this discrepancy generates chronic cognitive schema activation, helplessness, and dysphoria. The SOS quantifies this gap numerically, enabling direct empirical testing of cognitive-interpersonal vulnerabilities.

Validity

The psychometric validity of the Significant Others Scale has been demonstrated across diverse clinical, non-clinical, and medical populations over several decades.

Construct and Convergent Validity

In their initial validation studies, Power et al. (1988) demonstrated strong convergent validity between the SOS dimensions and established legacy instruments. SOS Actual Emotional Support scores correlated significantly and positively with the social support dimensions of the Social Support Questionnaire (SSQ; Sarason et al., 1983) (r values ranging from .54 to .68, p < .001). Furthermore, the SOS demonstrated substantial convergence with interview-based ratings of social relationships using the Brown and Harris Camberwell Collaborative Depression Scale methodology. When compared against the Interview Schedule for Social Interaction (ISSI; Henderson et al., 1980), the SOS Practical Support scale correlated robustly with ISSI availability of practical attachment (r = .58), while SOS Emotional Support correlated with the ISSI availability of close emotional attachment (r = .62).

Criterion and Predictive Validity

Predictive validity has been established through prospective longitudinal investigations examining the onset and recovery trajectories of affective disorders. Champion and Power (1995) verified that baseline Actual Emotional Support scores negatively predicted the emergence of major depressive episodes over a 12-month follow-up period in women exposed to high-magnitude adverse life events. Importantly, the SOS Discrepancy Score (Ideal minus Actual) demonstrated superior predictive power for depressive relapse compared to simple Actual ratings alone, validating the cognitive discrepancy hypothesis. Patients who exhibited elevated discrepancies regarding their primary significant other showed significantly higher scores on the Beck Depression Inventory (BDI) and the General Health Questionnaire (GHQ-28).

Discriminant Validity

The SOS displays clear discriminant validity from personality traits such as neuroticism, extraversion, and social desirability. Correlations between the SOS subscales and the Eysenck Personality Inventory (EPI) Lie Scale or the Marlowe-Crowne Social Desirability Scale have consistently hovered around non-significance (r = −.06 to .12), indicating that responses are not artifactual products of impression management. While neuroticism correlates modestly with low perceived emotional support (r ≈ −.28), structural equation models show that the SOS accounts for substantial unique variance in psychological distress after controlling for neuroticism.

Reliability

The Significant Others Scale exhibits high psychometric reliability, evaluated across internal consistency and temporal stability metrics.

Internal Consistency

Across validation trials by Power et al. (1988) and subsequent cross-cultural investigations, the SOS has yielded high Cronbach’s alpha coefficients across all subscale partitions:

• Actual Emotional Support: α = .87 to .93 across target individuals.
• Actual Practical Support: α = .83 to .89 across target individuals.
• Ideal Emotional Support: α = .85 to .91 across target individuals.
• Ideal Practical Support: α = .81 to .88 across target individuals.
• Total Scale (Aggregated 10-Item Actual): α = .91 to .95.

Inter-item correlations within the subscales generally fall within the recommended optimal psychometric window of .40 to .70, demonstrating that the items represent cohesive psychological dimensions without excessive functional redundancy.

Test-Retest Stability

Temporal stability was evaluated by Power et al. (1988) in non-clinical cohorts over short (2-week) and extended (6-month) test intervals. Over a 2-week period, the test-retest reliability coefficient for the Actual Emotional scale was r = .86, and for Actual Practical support, r = .82 (both p < .001). Ideal support scales demonstrated similar stability (r = .81 to .84). Over an extended 6-month observation window in stable environments, stability coefficients remained substantial (r = .71 to .78). However, when individuals experienced major interpersonal life transitions (e.g., marital dissolution, new intimate partnership), the SOS registered significant, predictable shifts in score profiles, confirming both longitudinal reliability and sensitivity to genuine contextual change.

Factor Analysis

The structural composition of the Significant Others Scale was originally established via exploratory factor analysis (EFA) using principal components analysis with varimax rotation, and subsequently validated across numerous investigations using confirmatory factor analysis (CFA).

Exploratory Factor Solutions

During scale development, Power, Champion, and Aris (1988) subjected the 10 core functional items to factor analysis across ratings applied to distinct significant figures (e.g., spouses, parents, best friends). Across all relationship classes, eigenvalues and scree test plots consistently supported a two-factor orthogonal or oblique solution accounting for approximately 58% to 67% of the total variance:

• Factor 1: Emotional Support: Consistently defined by high factor loadings (> .60) on Item 1 (trust/confide, loading = .81), Item 2 (lean on in difficulty, loading = .84), Item 3 (interest/reassurance, loading = .75), Item 4 (physical comfort, loading = .66), and Item 5 (resolve disagreements, loading = .62). Cross-loadings onto Practical Support were systematically low (< .30).
• Factor 2: Practical Support: Defined by dominant loadings on Item 6 (financial/practical help, loading = .80), Item 7 (advice/feedback, loading = .68), Item 8 (visit/socialize, loading = .65), Item 9 (emergency help, loading = .79), and Item 10 (shared hobbies/fun, loading = .64).

Confirmatory Factor Analysis (CFA) and Invariance

Subsequent psychometric evaluations utilizing structural equation modeling have tested competitive models (unidimensional single-factor model vs. two-factor correlated model vs. hierarchical bifactor model). The two-factor correlated model repeatedly demonstrates superior fit indices over the unidimensional model across both clinical and community samples (e.g., Comparative Fit Index [CFI] > .94, Tucker-Lewis Index [TLI] > .93, Root Mean Square Error of Approximation [RMSEA] ≤ .055). Multi-group CFA has further established metric and scalar measurement invariance across genders and age cohorts, confirming that the SOS assesses the identical conceptual construct in both men and women.

Instrument / Measurement Tool

The Significant Others Scale (SOS) is structured as follows:

• Instrument Type: Multi-target, multi-dimensional self-report questionnaire / interpersonal rating grid.
• Target Population: Adolescents and adults (ages 16+) across clinical, psychiatric, medical, and general population settings.
• Administration Time: Approximately 10 to 15 minutes for 2 to 4 nominated significant others.
• Number of Core Functional Items: 10 standardized functional items evaluated per nominated person.
• Nominated Targets: Typically 4 distinct persons (e.g., Significant Other 1: Spouse/Partner; Significant Other 2: Closest Family Member; Significant Other 3: Closest Friend; Significant Other 4: Work Colleague or Secondary Tie).
• Dual-Rating Structure: For each item and each nominated individual, two complementary ratings are completed:
  • Actual Support (a): “To what extent can you…?” (Assesses real-world experienced support).
  • Ideal Support (b): “What rating would your ideal be?” or “To what extent would you like to be able to…?” (Assesses aspirational/desired support).
• Response Scale: 7-point Likert-type scale anchored from 1 = never to 7 = always.
• Subscale Delineations:
  • Emotional Support Subscale: Sum or mean of Items 1, 2, 3, 4, and 5.
  • Practical Support Subscale: Sum or mean of Items 6, 7, 8, 9, and 10.
• Scoring and Index Computation:
  • Person-Specific Actual Scores: Total or subscale sums for an individual target (ranging from 5 to 35 per subscale, or 10 to 70 total per person).
  • Person-Specific Discrepancy Scores: Calculated as [Ideal Score − Actual Score] for each subscale or overall item set. Scores > 0 indicate unmet support needs; scores near 0 indicate optimal congruence; scores < 0 indicate more support received than desired (intrusiveness).
  • Global Network Scores: Averages calculated across all nominated significant others to yield an aggregate index of network-level Actual Emotional Support, Actual Practical Support, and Network Discrepancy.

Permissions & Fee and Test Year

The Significant Others Scale was first introduced to the scientific literature in 1988 by Michael J. Power, L. A. Champion, and S. J. Aris via their publication in the British Journal of Clinical Psychology, published by John Wiley & Sons on behalf of the British Psychological Society. The instrument is generally considered in the public domain for non-commercial academic research, educational instruction, and individual clinical assessment purposes, provided that appropriate bibliographic citation is accorded to the original authors. No licensing fee is required for academic investigations. For large-scale commercial implementations, digital redistribution within proprietary clinical software, or pharmaceutical trial integration, clearance and permissions should be coordinated in accordance with standard British Psychological Society / Wiley journal licensing guidelines.

References

• Beck, A. T. (1976). Cognitive therapy and the emotional disorders. International Universities Press.
• Bowlby, J. (1969). Attachment and loss: Vol. 1. Attachment. Basic Books.
• Bowlby, J. (1980). Attachment and loss: Vol. 3. Loss: Sadness and depression. Basic Books.
• Brown, G. W., & Harris, T. (1978). Social origins of depression: A study of psychiatric disorder in women. Free Press.
• Champion, L. A., & Power, M. J. (1995). Social and cognitive approaches to depression: Towards a new synthesis. British Journal of Clinical Psychology, 34(4), 485–503. https://doi.org/10.1111/j.2044-8260.1995.tb01484.x
• 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
• Henderson, S., Duncan-Jones, P., Byrne, D. G., & Adcock, S. (1980). Measuring social relationships: The Interview Schedule for Social Interaction. Psychological Medicine, 10(4), 723–734. https://doi.org/10.1017/s0033291700055019
• Higgins, E. T. (1987). Self-discrepancy: A theory relating self and affect. Psychological Review, 94(3), 319–340. https://doi.org/10.1037/0033-295X.94.3.319
• Power, M. J., Champion, L. A., & Aris, S. J. (1988). The development of a measure of social support: The Significant Others (SOS) Scale. British Journal of Clinical Psychology, 27(4), 349–358. https://doi.org/10.1111/j.2044-8260.1988.tb00799.x
• 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)