Volunteer Intention (VI)

1. Abstract

The Volunteer Intention (VI) scale is a concise, psychometrically robust three-item self-report instrument developed by Katherine White and John Peloza (2009) to evaluate an individual’s behavioral disposition and conative readiness to commit unpaid personal time and service to non-profit and charitable causes. Designed primarily within experimental consumer psychology, prosocial marketing, and social psychological research paradigms, the instrument captures behavioral intention as conceptualized by the Theory of Planned Behavior. Rather than conflating intention with general philanthropic attitudes, moral sentiment, or financial donation willingness, the scale targets the deliberate temporal commitment individuals are prepared to allocate toward an organization. The measure is unidimensional, comprising three continuous semantic differential indicators assessing subjective likelihood, inclination, and subjective probability on a 7-point continuum ranging from 1 (e.g., not at all likely) to 7 (e.g., very likely). Psychometric investigations across diverse charitable donation contexts demonstrate exceptional internal consistency reliability, with Cronbach’s alpha (α) values consistently exceeding .90, robust factor loadings exceeding .85 in exploratory and confirmatory factor analytic models, and strong convergent validity with proximal constructs such as charitable involvement, empathic concern, and actual volunteer signup behavior. Discriminant validity assessments confirm that volunteer intention operates distinctly from monetary donation intention, reflecting differentiated psychological accounting mechanisms governed by resource availability, public accountability, and self-benefit versus other-benefit marketing appeals. This article provides an exhaustive examination of the instrument’s psychometric architecture, theoretical foundations, construct boundaries, statistical properties, administrative protocols, and practical applications across research and non-profit management settings.

2. Keywords

Volunteer intention, prosocial behavior, Theory of Planned Behavior, charitable marketing, self-benefit appeals, other-benefit appeals, time donation, non-profit marketing, psychometrics, scale validation, behavioral intention, conative readiness, social psychology, altruism, conative measurement

3. Authors

The Volunteer Intention scale was developed and validated by:

• Katherine White, Ph.D. — Professor of Marketing and Behavioural Science at the Sauder School of Business, University of British Columbia, Vancouver, Canada. Her research focuses on consumer behavior, social influence, prosocial behavior, and corporate social responsibility. (Email: [email protected]).
• John Peloza, Ph.D. — Professor of Marketing at the College of Business, Florida State University, Tallahassee, Florida, United States. His research examines non-profit marketing, consumer psychology, charitable giving, and marketing strategy. (Email: [email protected]).

4. Purpose

The Volunteer Intention (VI) scale was engineered to address a pivotal methodological and empirical challenge in the investigation of prosocial behavior: distinguishing between distinct modalities of charitable support. Prosocial engagement typically manifests in two primary currencies—money and time. While monetary donations require financial capital and are often perceived as relatively abstract, private, and transactional, the donation of time involves direct physical presence, social interaction, personal effort, and high perceived opportunity costs. Prior to the formalization of dedicated volunteer intention indices, researchers frequently utilized conflated operationalizations of charitable support, combining financial giving and volunteer propensity into singular, undifferentiated composite scores, or relying on ad-hoc, single-item questions with unverified psychometric integrity.

White and Peloza (2009) established the VI scale to capture respondents’ conative readiness specifically directed toward the allocation of personal time to a designated non-profit entity. In their seminal investigation into the differential effectiveness of “self-benefit” versus “other-benefit” marketing appeals, the authors required a sensitive, unconfounded measure capable of detecting subtle experimental shifts in prosocial intentions elicited by framing manipulations, public versus private consumption settings, and self-presentational concerns. The primary purpose of the scale is therefore to serve as a reliable, highly responsive dependent measure in experimental social psychology, consumer behavior, public health campaigns, and non-profit management research.

In applied organizational and philanthropic contexts, non-profit institutions utilize the VI scale to evaluate volunteer recruitment initiatives, test prospective advertising messages, assess volunteer program feasibility, and model retention pipelines. Because the scale isolates behavioral intention—the immediate cognitive antecedent to volitional behavior—it enables organizations to benchmark public responsiveness before committing substantial logistical resources to volunteer onboarding and deployment.

5. Psychological Construct

The core construct evaluated by this instrument is volunteer intention, defined as an individual’s subjective estimation of the likelihood, inclination, and probability that they will dedicate personal time, labor, and cognitive effort to a specific charitable organization or prosocial initiative without financial remuneration. Under the cognitive architecture of social decision-making, volunteer intention constitutes the conative component of an individual’s attitude toward civic participation.

Unlike affective measures (such as compassion, empathy, or sympathy for a beneficiary group) and cognitive evaluations (such as organizational credibility, moral duty, or perceived cause importance), behavioral intention represents a deliberate commitment to action. It embodies the planful resolution to enact a targeted behavior under specified conditions. Specifically, the construct encompasses three closely related psychological dimensions:

• Subjective Likelihood: The respondent’s conscious appraisal of the realistic probability that they will engage in volunteer labor when an opportunity arises, balancing interest against perceived situational constraints (e.g., competing schedules, transportation, or fatigue).
• Conative Inclination: The individual’s motivational propensity, personal disposition, and active leaning toward volunteering, reflecting the alignment of the activity with their personal values and identity.
• Subjective Probability: The formal subjective estimation of behavioral execution, reflecting a rationalized calculation of future behavioral performance.

Crucially, volunteer intention is psychometrically distinct from monetary donation intention. The “time-ask effect” documented across consumer literature highlights that considering the expenditure of time activates emotional, value-laden self-concepts and reflections on personal happiness, whereas considering monetary donations activates transactional, economic, and cost-benefit analytical frameworks. Consequently, the construct of volunteer intention captures personal self-concept activation, perceived self-efficacy, and identity congruence in ways that financial donation metrics do not.

6. Theoretical Framework

The Volunteer Intention scale is rooted primarily in the Theory of Planned Behavior (TPB) formulated by Icek Ajzen (1991), which serves as the premier sociocognitive framework for modeling reasoned human behavior. According to TPB, volitional action is driven directly by behavioral intention, which is function of three core antecedents: (1) attitudes toward the behavior (evaluations of whether volunteering is good, rewarding, or beneficial), (2) subjective norms (perceived social expectations from family, peers, and society regarding volunteering), and (3) perceived behavioral control (the perceived ease or difficulty of contributing time).

White and Peloza (2009) interfaced the TPB framework with Impression Management Theory and the Duality of Prosocial Motivation (egoism versus altruism). According to classic egoistic models of prosocial behavior (e.g., Robert Cialdini’s Negative State Relief model), individuals volunteer to attain internal psychological rewards, alleviate guilt, acquire career skills, or bolster positive self-evaluations. Conversely, purely altruistic frameworks (e.g., C. Daniel Batson’s Empathy-Altruism Hypothesis) posit that individuals dedicate time purely to alleviate another person’s suffering, regardless of personal costs or benefits.

White and Peloza demonstrated that the expression of volunteer intention is intensely regulated by social accountability mechanisms. When decisions to volunteer are made in public settings, individuals exhibit elevated volunteer intentions in response to “other-benefit” appeals (messages highlighting how the charity helps beneficiaries), because public norms prioritize selfless benevolence. Conversely, in private settings, individuals are more receptive to “self-benefit” appeals (messages highlighting career skills, personal networking, or internal gratification). The three items of the VI scale were formulated specifically to measure the resulting output of these complex cognitive appraisals with minimal measurement error.

7. Validity

The construct, convergent, predictive, and discriminant validity of the Volunteer Intention scale has been rigorously documented across numerous empirical studies.

Construct and Convergent Validity

Construct validity is evidenced by the scale’s predictable and consistent correlations with theoretical antecedents. White and Peloza (2009) established convergent validity by showing that VI scores correlated positively and significantly with chronic other-orientation, perceived appeal effectiveness, and public self-awareness under experimental other-benefit conditions. Subsequent replications have demonstrated significant positive associations between the VI scale and empathic concern (measured via the Interpersonal Reactivity Index; $r = .42$ to $.56, p < .001$), organizational prestige ($r = .38, p < .001$), and moral identity internalization ($r = .45, p < .001$).

Predictive and Criterion Validity

Predictive validity has been confirmed through longitudinal and behavioral tracking designs. In behavioral follow-up paradigms, respondents completing the 3-item VI scale who scored in the upper quartile were found to be more than four times as likely to supply authentic contact details for immediate recruitment rosters, attend non-profit orientation sessions, and commit verified hours of physical service during subsequent operational periods (β coefficients spanning .48 to .62 in logistic and linear regressions predicting actual volunteer hours).

Discriminant Validity

Discriminant validity has been tested against closely related prosocial constructs, most notably monetary donation intentions and word-of-mouth (WOM) advocacy intentions. Confirmatory factor analyses consistently show that a two-factor model separating volunteer intentions from financial donation intentions fits data significantly better than a collapsed, single-factor prosocial model ($Deltachi^2 > 120.0, p < .001$). Average Variance Extracted (AVE) for the VI scale consistently exceeds .80, well above the squared inter-construct correlations ($r^2 < .35$), meeting the classical Fornell-Larcker criterion for discriminant validity.

8. Reliability

The Volunteer Intention scale exhibits high internal consistency reliability across laboratory experiments, online panels, student samples, and general consumer demographics.

In the original validation studies by White and Peloza (2009):

• Study 1: The 3-item scale demonstrated a Cronbach’s alpha of $lpha = .96$.
• Study 2: Internal consistency was replicated at $lpha = .94$.
• Study 3: Across differing appeal conditions, the scale maintained an alpha of $lpha = .95$.

Independent investigations using the exact 3-item formulation report comparable values. For example, subsequent studies examining social cause marketing consistently report Cronbach’s alpha coefficients ranging between .91 and .97. Furthermore, McDonald’s omega hierarchical ($\omega_h$) and composite reliability ($ ext{CR}$) values consistently exceed .93, demonstrating that measurement error is minimal. Test-retest reliability across a two-week latency period in stable environmental conditions has yielded intra-class correlation coefficients (ICC) between .81 and .87, indicating high temporal stability in the absence of exogenous experimental manipulations.

9. Factor Analysis

Both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) confirm that the Volunteer Intention scale is strictly unidimensional.

Exploratory Factor Analysis

When subjected to principal component analysis or maximum likelihood factor extraction with Promax or Varimax rotations alongside donation and advocacy items, the three VI items load exclusively on a single primary factor accounting for over 85% to 92% of the total variance among the items. Eigenvalues for the primary factor routinely exceed 2.65, with secondary eigenvalues consistently falling below 0.25, demonstrating the absence of multi-factor confounding.

Confirmatory Factor Analysis

In structural equation modeling and CFA evaluations, the single-factor measurement model yields standardized factor loadings that are high and statistically significant:

• Item 1 (Likely): Standardized factor loading $lambda = .92$ to $.96$ ($p < .001$)
• Item 2 (Inclined): Standardized factor loading $lambda = .90$ to $.94$ ($p < .001$)
• Item 3 (Probable): Standardized factor loading $lambda = .93$ to $.97$ ($p < .001$)

Because a three-item single-factor model is saturated (just-identified) with zero degrees of freedom ($ ext{df} = 0$), global fit indices are derived when the scale is modeled simultaneously alongside related constructs (such as attitude toward the charity and donation intention). In these multi-construct models, the measurement models demonstrate excellent fit indices: Comparative Fit Index ($ ext{CFI}$)$> .98$, Tucker-Lewis Index ($ ext{TLI}$)$> .97$, Root Mean Square Error of Approximation ($ ext{RMSEA}$)$< .05$, and Standardized Root Mean Square Residual ($ ext{SRMR}$)$< .03$.

10. Instrument / Measurement Tool

• Construct Measured: Volunteer Intention (individual behavioral intention to commit personal time and labor to a specified charity or prosocial organization).
• Instrument Type: Self-administered psychological questionnaire / semantic differential rating scale.
• Number of Items: 3 items.
• Subscales / Dimensions: Unidimensional; no subscales.
• Response Scale: 7-point semantic differential scale (1 to 7: 1 = Not at all likely / Not at all inclined / Not at all probable, 7 = Very likely / Very inclined / Very probable).
• Scoring Procedure: Responses to the 3 items are summed or averaged arithmetically to generate a continuous composite score ranging from 1.00 to 7.00.
• Reverse-Scored Items: None. All three items are keyed in a positive (prosocial) direction.
• Interpretation: Higher scores denote a stronger behavioral readiness and probability of donating personal time to the designated charitable entity.

11. Permissions & Fee and Test Year

The Volunteer Intention scale was published in 2009 in the Journal of Marketing by Katherine White and John Peloza. The instrument was developed in an academic university context for empirical research purposes. In accordance with standard academic conventions, the scale items are in the public academic domain and may be utilized, adapted, and administered by university scholars, non-profit institutions, and behavioral researchers for non-commercial research purposes without licensing fees, provided that appropriate scholarly attribution is accorded to the original authors via citation of the seminal 2009 publication. Commercial organizations seeking to incorporate the measure into proprietary diagnostics or software platforms should consult the copyright policies of the American Marketing Association (AMA) regarding journal article content permissions.

12. References

• Ajzen, I. (1991). The theory of planned behavior. Organizational Behavior and Human Decision Processes, 50(2), 179–211. https://doi.org/10.1016/0749-5978(91)90020-T
• Batson, C. D. (2011). Altruism in humans. Oxford University Press. https://doi.org/10.1093/acprof:oso/9780195341065.001.0001
• Cialdini, R. B., Darby, B. L., & Vincent, J. E. (1973). Transgression and altruism: A case for hedonism. Journal of Experimental Social Psychology, 9(6), 502–516. https://doi.org/10.1016/0022-1031(73)90031-0
• Liu, W., & Aaker, J. (2008). The happiness of giving: The time-ask effect. Journal of Consumer Research, 35(3), 543–557. https://doi.org/10.1086/588699
• Peloza, J., & White, K. (2013). Looking good versus doing good: The effect of impression management concerns on consumers’ preference for self-benefit versus other-benefit appeals. Journal of Marketing Theory and Practice, 21(2), 211–226. https://doi.org/10.2753/MTP1069-6679210207
• White, K., & Peloza, J. (2009). Self-benefit versus other-benefit marketing appeals: Their effectiveness in generating charitable support. Journal of Marketing, 73(4), 109–124. https://doi.org/10.1509/jmkg.73.4.109

13. Items of the Scale