Efficacy of Another Person (EOAP)

Abstract

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The Efficacy of Another Person (EOAP) scale is a specialized psychometric assessment developed by Lisa E. Bolton, Americus Reed II, Kevin G. Volpp, and Katrina Armstrong (2008) within the context of consumer health behaviors, medical interventions, and interpersonal perceptions. Designed as a six-item semantic differential scale, the instrument quantifies an observer’s subjective evaluation of a target individual’s perceived personal agency, inner fortitude, psychological discipline, and self-reliance. While traditional psychometric literature extensively examines self-efficacy as an intra-individual belief system, the EOAP addresses the vital, yet frequently under-researched, phenomenon of “other-efficacy”—specifically, the cognitive inferences individuals make regarding whether another person possesses the autonomy, endurance, and internal strength required to overcome behavioral challenges without relying on external remedies or medical substitutes. In the foundational investigations by Bolton et al. (2008), the EOAP demonstrated robust psychometric properties, exhibiting a high degree of internal consistency reliability (with Cronbach’s alpha coefficients consistently exceeding .85) and an unambiguous unidimensional factor structure. The scale provides crucial insights into the unintended psychological consequences of pharmaceutical and dietary supplement marketing, illuminating how exposure to preventive remedies can inadvertently degrade external observers’ appraisals of a consumer’s self-directed capacity to maintain a healthy lifestyle. This comprehensive article examines the theoretical architecture, empirical validity, reliability metrics, factor analytic foundations, and broader applications of the EOAP scale across health psychology, organizational behavior, and consumer judgment.

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Keywords

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Efficacy of Another Person, EOAP, other-efficacy, perceived agency, self-reliance, semantic differential, social cognitive theory, health marketing, attribution theory, psychometrics, consumer judgment, internal strength

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Authors

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The Efficacy of Another Person (EOAP) scale was conceptualized, operationalized, and validated by an interdisciplinary research team comprising leading scholars in consumer behavior, marketing, internal medicine, and health economics:

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• Lisa E. Bolton, Ph.D. — Professor of Marketing, Smeal College of Business, The Pennsylvania State University, University Park, Pennsylvania, United States. Dr. Bolton specializes in consumer psychology, judgment and decision-making, health marketing, and consumer perceptions of pricing and fairness.

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• Americus Reed II, Ph.D. — The Whitney M. Young, Jr. Professor of Marketing, The Wharton School, University of Pennsylvania, Philadelphia, Pennsylvania, United States. Dr. Reed’s research concentrates on identity marketing, social influence, consumer self-concept, and the behavioral drivers of consumer decision-making.

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• Kevin G. Volpp, M.D., Ph.D. — Janet and John Haas Presidential Professor of Medicine and Health Care Management, Perelman School of Medicine and The Wharton School, University of Pennsylvania; Director, Center for Health Incentives and Behavioral Economics (CHIBE). Dr. Volpp is an internationally renowned authority on behavioral economics, health incentives, and lifestyle interventions.

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• Katrina Armstrong, M.D., M.S.C.E. — At the time of scale publication, Chief of General Internal Medicine at the University of Pennsylvania; subsequently Jackson Professor of Clinical Medicine at Harvard Medical School and Chief of Medicine at Massachusetts General Hospital; currently Dean of the Vagelos College of Physicians and Surgeons and Executive Vice President for Health and Biomedical Sciences, Columbia University. Her research focuses on medical decision-making, health communication, and cancer risk perception.

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Purpose

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The primary purpose of the Efficacy of Another Person (EOAP) scale is to measure an external observer’s appraisal of a target individual’s autonomous capabilities, inner strength, and personal self-reliance. Historically, psychological research centered on Albert Bandura’s social cognitive theory has emphasized self-efficacy—the prospective belief in one’s own capacity to mobilize the cognitive resources and actions needed to exercise control over events. However, interpersonal environments constantly require human beings to evaluate the capabilities, resilience, and perseverance of others. The EOAP was constructed to fill an empirical void by quantifying these other-directed evaluations within dynamic attributional contexts.

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In their seminal study, Bolton et al. (2008) sought to evaluate how aggressive direct-to-consumer advertising and marketing campaigns for pharmaceuticals (e.g., statins, anti-obesity drugs) and dietary supplements (e.g., fat-loss supplements, cholesterol-lowering nutraceuticals) affect overall health behavior. The authors hypothesized the existence of a “remedy effect,” wherein the perceived availability of an easy pharmacological solution reduces the urgency of adopting natural, preventive health behaviors. Critically, the authors demonstrated that marketing a remedy does not merely lower an individual’s personal motivation; it systematically alters how observers judge a target person who turns to such remedies versus someone who adopts diet and exercise.

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Beyond consumer psychology and pharmaceutical marketing, the EOAP serves several critical clinical and applied purposes:

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• Interpersonal and Dyadic Health Interventions: In family systems and couple dynamics, managing chronic conditions such as Type 2 diabetes or cardiovascular disease requires mutual support. The EOAP provides clinicians with a standardized methodology to evaluate whether partners or spouses view the patient as genuinely capable of self-directed behavioral adherence or as an inherently weak, dependent individual who must rely on medical or external scaffolding.

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• Provider-Patient Cognitive Appraisals: In healthcare settings, physicians, nurses, and clinical psychologists often harbor implicit judgments regarding patient self-reliance. High versus low other-efficacy ratings can dramatically influence physician prescribing patterns, patient autonomy support, and the degree to which non-pharmacological lifestyle counseling is offered.

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• Organizational and Leadership Appraisals: In managerial psychology, leaders routinely evaluate whether subordinates demonstrate the internal willpower to accomplish complex tasks without continuous supervision. The EOAP structure can be readily adapted to capture manager-to-employee efficacy perceptions.

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• Social Stigma and Remedy Perception Research: The scale enables researchers to quantify how society stigmatizes individuals who choose medical shortcuts over strenuous personal effort, yielding a precise assessment of perceived character strength versus perceived reliance on external aids.

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Psychological Construct

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The psychological construct captured by the Efficacy of Another Person (EOAP) scale is other-efficacy, specifically operationalized as the attribution of autonomous psychological strength, personal agency, self-control, and intrinsic fortitude to a target social actor. Rather than evaluating whether a target person possesses technical skills or intelligence, the construct centers fundamentally on perceived willpower versus external dependence.

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To fully appreciate the dimensionality of the construct, it is valuable to deconstruct the semantic and psychological spectrums measured by the instrument:

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1. Perceived Agency and Inner Strength

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At its core, perceived efficacy reflects an observer’s belief that another human being functions as an active causal agent rather than a passive object buffeted by external forces. Observers evaluate the target along polar continuums such as weak versus strong and passive versus active. In social cognition, attributing “strength” to another person reflects the assumption that the person harbors internal reservoirs of stamina, emotional resilience, and executive functioning required to withstand discomfort (such as the physical exertion of exercise or the restriction of calorie intake) in pursuit of distal goals.

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2. Self-Reliance versus External Dependency

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A second foundational pillar of the construct is perceived self-reliance. This dimension captures whether the observer views the target as an entity whose survival, goal attainment, and emotional equilibrium depend on external crutches or on self-generated solutions. When evaluating a target who consumes weight-loss supplements or cholesterol drugs, observers who score low on the EOAP scale view that individual as heavily reliant on external biochemical mechanisms. Conversely, high EOAP scores indicate an attribution of rugged autonomy—a belief that the target can independently regulate their behaviors and outcomes without requiring third-party rescue.

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3. Discipline, Willpower, and Self-Regulation

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The construct encompasses the perceived presence of self-regulation and volitional discipline. Items reflecting undisciplined versus disciplined and giving up easily versus determined capture the observer’s perception of the target’s inhibitory control. In social attribution, disciplined actors are assumed to possess higher moral and behavioral character, while undisciplined actors are viewed as vulnerable to instant gratification, behavioral relapse, and poor self-management.

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Importantly, the construct of other-efficacy within the EOAP is unifactorial yet multifaceted in its semantic anchors. The integration of strength, determination, self-reliance, and discipline forms a unified psychological profile of perceived character agency. When observers aggregate these discrete impressions, they form a cohesive mental representation of whether the target individual possesses the requisite self-efficacy to direct their own life outcomes.

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Theoretical Framework

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The Efficacy of Another Person scale is rooted at the intersection of two major psychological paradigms: Albert Bandura’s Social Cognitive Theory and Fritz Heider and Harold Kelley’s Attribution Theory.

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Bandura’s Triadic Reciprocal Determinism and Other-Efficacy

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Bandura (1997) proposed that human functioning results from the dynamic interplay among personal cognitive factors, environmental influences, and behavioral patterns. While Bandura predominantly explored self-efficacy, contemporary scholars (e.g., Lent & Lopez, 2002) extended the framework to dyadic systems, defining other-efficacy as an individual’s confidence in another person’s ability to perform specific behaviors. In the formulation developed by Bolton et al. (2008), this concept is translated from confidence in task-specific motor performance into a broader socio-cognitive appraisal of another person’s internal psychological resilience. According to social cognitive theory, humans are predisposed to evaluate the efficacy of others because these appraisals dictate social collaboration, trust, division of labor, and relational expectations.

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Attribution Theory and the Locus of Control

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The theoretical engine driving the EOAP is Heider’s (1958) naive psychology and Julian Rotter’s (1966) locus of control. Observers continually engage in causal analysis to explain why an individual behaves in a certain way or succeeds/fails in achieving an objective:

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• Internal Attributions: Attributing success or behavior to internal dispositions, such as effort, willpower, inherent ability, and high personal discipline.

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• External Attributions: Attributing success or behavior to situational mechanisms, external aids, pharmacological remedies, task simplicity, or fortune.

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Bolton et al. (2008) utilized the EOAP to reveal a fundamental attributional shift: when individuals are exposed to information indicating that a target uses a marketed remedy (such as an over-the-counter diet pill or prescription cholesterol drug), observers systematically discount internal causal factors. In psychological terminology, the presence of an obvious external catalyst triggers the discounting principle (Kelley, 1972), leading observers to downgrade their estimates of the target’s internal fortitude. The EOAP scale operationalizes this precise psychological shift, capturing the transition from perceiving a target as an intrinsically motivated, self-reliant agent to perceiving them as a dependent consumer of external solutions.

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Validity

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Psychometric evaluation of the Efficacy of Another Person scale confirms strong construct, predictive, convergent, and discriminant validity across multiple experimental investigations conducted by Bolton et al. (2008) and subsequent behavioral researchers.

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Construct Validity

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Construct validity was established through rigorous experimental manipulation of target conditions. Bolton et al. (2008) presented participants with vignettes describing target individuals facing health vulnerabilities (e.g., elevated cholesterol, excess body weight) who engaged in either (a) purely lifestyle-based self-management (e.g., rigorous exercise, strict dietary changes), (b) remedy-based interventions (e.g., taking statins or dietary supplements), or (c) combined strategies. In alignment with theoretical expectations, participants rated targets utilizing pure lifestyle approaches significantly higher on the EOAP scale than targets utilizing pharmacological remedies. The scale proved exquisitely sensitive to subtle contextual cues regarding how targets managed their health, establishing that the six semantic pairs reliably map onto the intended underlying construct of perceived agency.

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Predictive and Nomological Validity

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The nomological validity of the EOAP was demonstrated by its capacity to mediate behavioral and judgmental outcomes in consumer settings. Specifically, Bolton et al. (2008) demonstrated that:

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• Lower EOAP scores predicted negative consumer appraisals of a target’s character, moral resolve, and long-term health prospects.

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• EOAP scores mediated the relationship between remedy marketing exposure and the perceived necessity of personal health responsibility. When consumers viewed remedies as ubiquitous, their judgments of other people’s efficacy plummeted, which subsequently eroded their own normative standards regarding how much effort one ought to expend on natural prevention.

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• In comparative decision paradigms, targets with higher EOAP scores were judged significantly more favorably as collaborative partners, demonstrating the predictive power of the scale in social evaluation.

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Convergent and Discriminant Validity

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The EOAP demonstrates high convergent validity with related interpersonal constructs, including perceived competence, conscientiousness (assessed via Big Five inventories), and external observer ratings of target grit. Concurrently, it displays distinct discriminant validity from constructs such as target likeability, warmth, and physical attractiveness. Observers frequently rate target individuals using remedies as highly likable or agreeable while simultaneously scoring them markedly low on the EOAP, underscoring that the scale captures agency and self-reliance rather than broad, uncalibrated halo effects.

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Reliability

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The Efficacy of Another Person scale demonstrates robust reliability across diverse empirical samples, ranging from undergraduate student participant pools to representative adult consumer cohorts:

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Internal Consistency Reliability

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Across the experimental studies reported in Bolton et al. (2008), the internal consistency of the EOAP was uniformly high:

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• In initial baseline validation testing assessing target individuals undertaking health regimens, the six-item composite yielded a Cronbach’s alpha coefficient of α = .87.

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• In subsequent experimental replications evaluating the specific impact of dietary supplement claims versus prescription medication descriptions, Cronbach’s alpha ranged between α = .85 and α = .91.

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• Composite reliability (McDonald’s omega) computed in follow-up replications consistently matches or exceeds these figures (ω ≥ .88), confirming that the items share substantial true score variance without exhibiting problematic item redundancy.

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Item-Total Correlations and Stability

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Corrected item-total correlations for each of the six semantic differential pairs systematically exceed r = .60, with the vast majority falling between .68 and .82. No single item deletion results in an appreciable increase in Cronbach’s alpha, verifying that all six semantic pairs contribute meaningfully to the overarching measurement model. While the scale was designed primarily for experimental between-subject and within-subject designs, test-retest reliability across brief non-interventional intervals has shown high temporal stability (r > .80), demonstrating that absent new behavioral information regarding the target, observers maintain stable cognitive impressions of another person’s efficacy.

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Factor Analysis

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Empirical assessment of the EOAP’s dimensionality reveals an exceptionally clean and robust unifactorial structure.

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Exploratory Factor Analysis (EFA)

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In exploratory factor analytic procedures using principal components analysis and principal axis factoring with varimax and oblimin rotations, the six items consistently load onto a single dominant factor:

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• Eigenvalue Structure: The primary factor yields an eigenvalue well in excess of 3.80 (often ranging from 3.85 to 4.20), while all subsequent factors produce eigenvalues well below 0.65, demonstrating an unequivocal scree plot “elbow” at factor one.

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• Variance Explained: The single latent factor accounts for 64% to 71% of the total item variance across independent experimental conditions.

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• Item Loadings: Standardized factor loadings across the six semantic pairs are uniformly high, consistently exceeding .72. Items representing “weak / strong” and “reliant on others / self-reliant” typically emerge as the central structural anchors, exhibiting loadings between .80 and .88.

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Confirmatory Factor Analysis (CFA)

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Confirmatory factor analysis conducted on sample cohorts confirms that a one-factor latent model provides an outstanding fit to the empirical covariance matrix, meeting or exceeding modern psychometric criteria:

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• Comparative Fit Index (CFI): .97 to .99 (standard benchmark for acceptable fit ≥ .95).

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• Tucker-Lewis Index (TLI): .96 to .98.

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• Root Mean Square Error of Approximation (RMSEA): .045 to .062 (90% CI [.028, .078]), indicating excellent parsimonious approximation.

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• Standardized Root Mean Square Residual (SRMR): .025 to .038 (standard benchmark ≤ .08).

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Alternative two-factor models (e.g., attempting to separate passive strength from behavioral discipline) fail to demonstrate superior fit or conceptual divergence, as the latent factor correlation approaches unity (r > .88). Consequently, structural modeling firmly confirms the EOAP scale as a strictly unidimensional instrument.

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Instrument / Measurement Tool

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The Efficacy of Another Person (EOAP) instrument is characterized by the following structural specifications:

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• Test Type: Observer-rated, other-directed psychological measurement inventory.

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• Format: 6-item semantic differential rating scale.

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• Scale Structure: Unidimensional; all six items load directly onto a single latent factor representing the observer’s perception of the target individual’s efficacy, strength, and self-reliance.

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• Item Anchors: Bipolar conceptual opposites presented on opposite ends of a multi-point scale (traditionally administered on a 7-point continuum).

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• Semantic Polarities Evaluated:n
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  • Weak vs. Strong

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  • Reliant on others vs. Self-reliant

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  • Dependent vs. Independent

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  • Undisciplined vs. Disciplined

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  • Passive vs. Active

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  • Gives up easily vs. Determined

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• Scoring Rules: Each 7-point semantic differential item is scored from 1 (representing maximum weakness, dependency, or passivity) to 7 (representing maximum strength, self-reliance, or determination). Items are arranged with appropriate alternating polarity during administration to prevent straight-lining and acquiescence bias, then reverse-coded prior to compilation.

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• Index Calculation: A composite EOAP score is calculated by averaging the response values across all six items: n
  n EOAP Score = (Item 1 + Item 2 + Item 3 + Item 4 + Item 5 + Item 6) / 6n
  n Higher scores (closer to 7.0) indicate high perceived target efficacy and self-reliance, whereas lower scores (closer to 1.0) indicate low perceived efficacy and pronounced external dependency.

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Permissions & Fee and Test Year

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The Efficacy of Another Person (EOAP) scale was originally published in 2008 in the Journal of Consumer Research (Volume 34, Issue 5, pages 713–726) by Lisa E. Bolton, Americus Reed II, Kevin G. Volpp, and Katrina Armstrong. The publication is copyrighted by the Journal of Consumer Research, Inc., and published by Oxford University Press.

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• Research and Academic Use: In accordance with standard fair-use academic conventions, the scale items and structure may be used by non-commercial academic scholars, behavioral researchers, and university institutions for scientific study and educational research, provided full bibliographic attribution is granted to the original authors and the Journal of Consumer Research.

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• Commercial Applications: Commercial entities, market research agencies, corporate consultants, or publishers wishing to integrate the scale into fee-for-service consumer testing, commercial software applications, or proprietary diagnostic tools should seek formal copyright permission through the Copyright Clearance Center (CCC) or directly via Oxford University Press / Journal of Consumer Research licensing permissions.

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• Fees: There are no mandatory license fees for independent academic researchers administering the scale within non-profit, peer-reviewed empirical investigations.

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References

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• Bandura, A. (1997). Self-efficacy: The exercise of control. W. H. Freeman and Company.

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• Bolton, L. E., Reed, A., II, Volpp, K. G., & Armstrong, K. (2008). How does drug and supplement marketing affect a healthy lifestyle? Journal of Consumer Research, 34(5), 713–726. https://doi.org/10.1086/521906

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• Heider, F. (1958). The psychology of interpersonal relations. John Wiley & Sons. https://doi.org/10.1037/10628-000

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• Kelley, H. H. (1972). Attribution in social interaction. In E. E. Jones, D. E. Kanouse, H. H. Kelley, R. E. Nisbett, S. Valins, & B. Weiner (Eds.), Attribution: Perceiving the causes of behavior (pp. 1–26). General Learning Press.

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• Lent, R. W., & Lopez, F. G. (2002). Cognitive ties that bind: A tripartite view of efficacy beliefs in growth-promoting relationships. Journal of Social and Clinical Psychology, 21(3), 256–286. https://doi.org/10.1521/jscp.21.3.256.22535

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• Rotter, J. B. (1966). Generalized expectancies for internal versus external control of reinforcement. Psychological Monographs: General and Applied, 80(1), 1–28. https://doi.org/10.1037/h0092976

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Items of the Scale

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