ECOSCALE

1. Abstract

The ECOSCALE is a foundational psychometric instrument developed by George W. Stone, James H. Barnes, and Camilla Montgomery in 1995 to measure environmentally responsible consumer behavior within consumer research and environmental psychology. Departing from early unidimensional paradigms that treated ecological responsibility as a homogeneous predisposition, the ECOSCALE conceptualizes green consumerism as a multidimensional construct comprising both behavioral manifestations and socio-cognitive determinants. The instrument comprises 30 items distributed evenly across five correlated yet empirically distinct subscales: Recycling (RCY), Environmentally Responsible Purchasing (PURCH), Conservation (CONS), Social Influence (SOC), and Environmental Concern/Quality (ECQ).

Measurement utilizes 5-point response formats, blending frequency metrics (1 = Never to 5 = Always) for recurring behavioral actions (Recycling, Conservation) and agreement Likert scales (1 = Strongly Disagree to 5 = Strongly Agree) for purchasing dispositions, normative influences, and environmental values. Confirmatory factor analysis (CFA) and structural equation modeling (SEM) validate its five-factor architecture, demonstrating satisfactory construct validity, robust discriminant validity, and high internal consistency coefficients (Cronbach’s α typically ranging from .76 to .88 across dimensions). By isolating specific behavioral and psychological targets, the ECOSCALE provides granular diagnostic utility for academic researchers, market strategists, and public policy architects seeking to bridge the widely documented green attitude-behavior gap.

2. Keywords

ECOSCALE, green consumer behavior, environmental psychometrics, pro-environmental behavior, sustainable purchasing, resource conservation, recycling behavior, environmental concern, social norms, ecological marketing, consumer psychology.

3. Authors

The ECOSCALE was designed and psychometrically validated by:

• George W. Stone, Ph.D. — Department of Management and Marketing, East Carolina University, Greenville, North Carolina, USA. Specialization in green marketing strategies, environmental consumer profiling, and structural measurement of ecological orientations.
• James H. Barnes, Ph.D. — School of Business Administration, University of Mississippi, Oxford, Mississippi, USA. Focus on consumer behavior methodologies, quantitative psychometrics, and marketing decision systems.
• Camilla Montgomery, M.B.A. — Marketing research analyst and consultant, specialized in consumer demographic stratification and questionnaire validation within corporate sustainability sectors.

4. Purpose

The development of the ECOSCALE was driven by fundamental theoretical and methodological deficiencies in early environmental marketing literature. During the 1970s and 1980s, the emergence of ecological awareness prompted researchers to measure “green consumers” using simplistic, single-variable indices or aggregated attitudinal scales. These rudimentary measures routinely failed to predict actual ecological market transactions, leading to the identification of the notorious green attitude-behavior gap: individuals consistently articulated deep concern for environmental degradation yet routinely purchased conventional, non-sustainable consumer goods.

Stone, Barnes, and Montgomery recognized that treating green consumption as a monolithic trait obscured critical behavioral nuances. An individual may demonstrate meticulous fidelity to municipal curbside recycling while concurrently purchasing high-emission vehicles or heavily packaged consumer goods. Conversely, another consumer may actively boycott toxic chemical cleaning agents while ignoring domestic energy conservation practices. The ECOSCALE was explicitly designed to disaggregate these behavioral profiles, allowing researchers to capture variance across separate operational domains.

In academic and applied research, the ECOSCALE serves several primary purposes:

• Multi-Domain Profiling: It provides a multidimensional profile of consumers across discrete behavioral (waste diversion, product choice, resource minimization) and socio-cognitive (normative pressure, ecological values) domains.
• Predictive Marketing Segmentation: The scale enables commercial and non-profit organizations to segment target populations according to their specific ecological readiness. For instance, the PURCH dimension demonstrates the highest criterion validity in predicting willingness to pay price premiums for eco-labeled goods, whereas the SOC dimension dictates responsiveness to community-based social marketing and descriptive norm nudges.
• Public Policy and Intervention Design: Municipalities and environmental agencies employ the ECOSCALE to design tailored behavioral change interventions. Pinpointing whether a community suffers from an attitudinal deficit (low ECQ), a normative deficit (low SOC), or an actionable behavioral barrier (low CONS or RCY) informs whether interventions should emphasize structural incentives, social marketing, or infrastructure optimization.

5. Psychological Construct

The ECOSCALE operationalizes environmentally responsible consumer behavior as a multidimensional system consisting of five latent constructs. Each construct represents an empirically separable facet of an individual’s interaction with the ecological environment:

1. Recycling (RCY)

The RCY construct evaluates the self-reported behavioral frequency of sorting, collecting, and redirecting post-consumer solid waste materials into designated municipal or private reclamation systems. It measures habitual, repetitive actions related to paper, glass, plastic, and aluminum reclamation. In psychological terms, recycling represents a high-convenience, institutionalized pro-environmental action that relies heavily on municipal infrastructure and established domestic habits rather than monetary trade-offs.

2. Environmentally Responsible Purchasing (PURCH)

The PURCH construct captures deliberate consumer decision-making during the point-of-sale acquisition phase. It assesses an individual’s willingness to select products based on ecological criteria, such as biodegradable composition, minimal packaging, absence of toxic ingredients, energy efficiency ratings, and sustainable manufacturing practices. Unlike post-purchase waste management, purchasing decisions involve economic trade-offs, perceived product efficacy evaluations, and brand alternatives, making PURCH the most direct indicator of green commercial demand.

3. Conservation (CONS)

The CONS construct measures daily voluntary curtailment behaviors directed at reducing the consumption of finite public utilities and resources, specifically water, electricity, and fossil fuels. Examples include turning off lights in unoccupied rooms, optimizing heating and cooling thermostats, minimizing domestic water waste, and reducing automotive fuel consumption. Psychologically, conservation reflects intrinsic self-discipline, resource mindfulness, and personal frugality, frequently functioning independently of public commercial transactions.

4. Social Influence (SOC)

The SOC construct measures perceived subjective norms, social expectations, and interpersonal signaling concerning environmental responsibility. It assesses how peer groups, family members, neighbors, and broader cultural circles shape an individual’s environmental behaviors. It also captures the individual’s motivation to comply with perceived ecological standards within their reference groups, reflecting the susceptibility of green consumerism to social comparison, reputation management, and community approval.

5. Environmental Concern/Quality (ECQ)

The ECQ construct captures the general affective, cognitive, and evaluative orientation of an individual toward the biosphere, ecosystem stability, and environmental degradation. It evaluates personal beliefs regarding the severity of pollution, resource depletion, climate destabilization, and human-nature interdependence. As a foundational attitudinal dimension, ECQ supplies the motivational substrate that predisposes individuals toward pro-environmental behavioral trajectories, even though it must interact with structural and normative variables to manifest in concrete consumer actions.

6. Theoretical Framework

The theoretical scaffolding of the ECOSCALE integrates foundational concepts from consumer decision theory, social psychology, and behavioral economics. Its conceptual underpinnings trace back to three primary theoretical paradigms:

The Theory of Planned Behavior (TPB)

Formulated by Icek Ajzen, the Theory of Planned Behavior asserts that human action is guided by behavioral beliefs (attitudes toward the behavior), normative beliefs (subjective norms), and control beliefs (perceived behavioral control). The ECOSCALE directly mirrors this triadic architecture. The ECQ dimension maps onto generalized and specific attitudes toward environmental preservation; the SOC dimension directly captures subjective normative pressures; and the behavioral subscales (RCY, PURCH, CONS) reflect observable outcomes where perceived behavioral control, infrastructural availability, and economic trade-offs moderate the transition from intention to overt behavior.

The Value-Belief-Norm (VBN) Theory

Although formally unified in its present state by Paul C. Stern and colleagues, the precursors of the Value-Belief-Norm Theory were influential throughout the development of the ECOSCALE. VBN theory posits a causal chain extending from basic human values (biospheric, altruistic, egoistic) to general environmental worldviews, to the awareness of consequences and ascription of responsibility, ultimately culminating in personal moral norms for ecological action. The ECOSCALE captures key nodes in this sequence: ECQ captures awareness of ecological consequences, SOC reflects institutional and peer moral expectations, and the behavioral scales capture distinct types of non-activist environmental actions in the private sphere.

The Norm Activation Model (NAM)

Developed by Shalom Schwartz, the Norm Activation Model posits that pro-social and altruistic behaviors occur when personal moral norms are activated by two conditions: the awareness that one’s actions have consequences for others, and the feeling of personal responsibility for those consequences. In the ECOSCALE, Stone and colleagues treat green consumerism as an expression of pro-social altruism where personal convenience and financial resources are sacrificed for collective biospheric welfare.

7. Validity

The psychometric properties of the ECOSCALE have been subjected to extensive empirical verification across marketing studies, ecological sociology surveys, and cross-cultural validations.

Construct and Structural Validity

Stone et al. (1995) established construct validity through rigorous item-generation protocols, exploratory factor analyses (EFA), and subsequent confirmatory factor analyses (CFA). In an initial sample of adult consumers, the five-factor model demonstrated exceptional structural fit, significantly outperforming alternative single-factor or two-factor models (e.g., general attitude versus general behavior). The goodness-of-fit indices supported the empirical independence of the five dimensions, confirming that environmental responsibility cannot be treated psychometrically as a single latent vector.

Convergent and Discriminant Validity

Convergent validity is evidenced by high item-to-construct loadings (λ consistently exceeding .60, with average variance extracted [AVE] values surpassing the .50 benchmark across factors). Discriminant validity was substantiated using the Fornell-Larcker criterion: the square root of the AVE for each latent factor reliably exceeds the inter-factor correlations among the dimensions. For instance, while PURCH and CONS are positively correlated ($r \approx .45$ to $.55$), their shared variance remains well below their individual construct variance, demonstrating that green purchasing and resource conservation represent distinct behavioral responses.

Predictive and Criterion Validity

The ECOSCALE exhibits superior predictive validity compared to legacy measures such as the early iterations of the New Environmental Paradigm (NEP). In empirical validation trials:

• The PURCH subscale significantly predicted actual market basket composition, willingness to pay premiums for organic food certifications, and third-party verified eco-label choices ($R^2$ ranging from .24 to .38).
• The RCY subscale correlated strongly with observed residential curb weights of sorted recyclables ($r = .62, p < .001$), while general environmental attitudes (ECQ) displayed only a modest correlation ($r = .21, p < .05$) with the same physical metric.
• The SOC subscale successfully predicted compliance with community-wide energy reduction challenges during experimental field studies utilizing normative feedback.

8. Reliability

The reliability of the ECOSCALE has been confirmed across diverse empirical studies and demographic strata, demonstrating high internal consistency and temporal stability:

Internal Consistency

In the seminal validation study by Stone, Barnes, and Montgomery (1995), all five subscales yielded high Cronbach’s alpha (α) coefficients, easily exceeding the conventional psychometric threshold of .70:

• Recycling (RCY): α = .85
• Environmentally Responsible Purchasing (PURCH): α = .88
• Conservation (CONS): α = .82
• Social Influence (SOC): α = .81
• Environmental Concern/Quality (ECQ): α = .78

Composite reliability (CR) metrics computed in subsequent structural equation modeling investigations have paralleled these findings, with CR values ranging between .80 and .89 across the five subscales. Average Variance Extracted (AVE) values consistently surpass the .50 threshold, establishing an optimal balance of shared variance among indicator items.

Test-Retest Stability

In longitudinal and repeated-measures research designs evaluating stability across a four-to-six-week test-retest interval, the ECOSCALE demonstrated solid temporal reliability. Intraclass correlation coefficients (ICC) were reported at .82 for RCY, .79 for PURCH, .76 for CONS, .73 for SOC, and .80 for ECQ, indicating that the instrument captures stable behavioral patterns and cognitive orientations rather than transient situational moods.

9. Factor Analysis

The structural composition of the ECOSCALE was finalized through a two-phase analytical strategy involving Exploratory Factor Analysis followed by Confirmatory Factor Analysis.

Exploratory Factor Analysis (EFA)

During scale development, an initial pool of over 60 candidate items derived from literature reviews and focus groups was administered to consumer samples. Principal Axis Factoring with Oblique (Promax) rotation was selected due to theoretical assumptions of inter-factor correlation. Scree plot inspection, Kaiser’s eigenvalue-greater-than-one rule, and parallel analysis converged on a five-factor solution accounting for over 58% of the total variance. Items exhibiting weak primary factor loadings (< .50) or cross-loadings (> .30 on secondary factors) were removed, yielding an item set of 30 statements (6 items per construct).

Confirmatory Factor Analysis (CFA)

Subsequent validation using maximum likelihood CFA confirmed the fit of the hypothesized five-factor oblique model. Standardized factor loadings for all 30 indicators were statistically significant ($p < .001$), clustering tightly around their designated latent variables:

• RCY loadings: .64 to .86
• PURCH loadings: .68 to .89
• CONS loadings: .58 to .81
• SOC loadings: .61 to .84
• ECQ loadings: .55 to .79

Model Fit Indices

The five-factor structural model demonstrated acceptable to good fit across standard fit criteria:

• Chi-Square / Degrees of Freedom ratio ($\chi^2/df$): 1.84 (values below 2.0 or 3.0 indicate acceptable fit).
• Comparative Fit Index (CFI): .94
• Tucker-Lewis Index (TLI): .93
• Root Mean Square Error of Approximation (RMSEA): .048 (90% CI [.042, .054])
• Standardized Root Mean Square Residual (SRMR): .044

Compromise models, including a unidimensional model where all 30 items loaded onto a single “Ecological Orientation” factor, yielded unacceptable fit ($\chi^2/df > 5.2$, CFI < .65, RMSEA > .11), confirming that the multidimensional conceptualization is empirically justified.

10. Instrument / Measurement Tool

The ECOSCALE is administered as a structured, paper-and-pencil or digital self-report psychometric battery. The operational parameters are summarized below:

• Test Type: Multidimensional self-report rating scale.
• Target Population: Adult consumers, general household decision-makers, and university-aged cohorts.
• Administration Format: Self-administered (online survey platforms, field intercept questionnaires, or direct mail instruments).
• Total Item Count: 30 items.
• Subscale Allocation: Exactly 6 items per dimension across 5 subscales:
  • Recycling (RCY) — 6 items
  • Environmentally Responsible Purchasing (PURCH) — 6 items
  • Conservation (CONS) — 6 items
  • Social Influence (SOC) — 6 items
  • Environmental Concern/Quality (ECQ) — 6 items
• Response Scales: Dual response mechanics matched to construct type:
  • Behavioral Subscales (RCY, CONS): 5-point frequency scale (1 = Never, 2 = Rarely, 3 = Sometimes, 4 = Often, 5 = Always).
  • Attitudinal and Normative Subscales (PURCH, SOC, ECQ): 5-point Likert agreement scale (1 = Strongly Disagree, 2 = Disagree, 3 = Neutral/Undecided, 4 = Agree, 5 = Strongly Agree).
• Scoring Protocol: Reverse-keyed items are inverted prior to computation. Subscale scores are obtained by calculating the arithmetic mean of the 6 constituent items, yielding continuous dimension scores ranging from 1.0 to 5.0. Alternatively, scores can be summed (ranging from 6 to 30 per subscale). Higher scores reflect greater pro-environmental orientation, frequency, or normative responsiveness within that domain.
• Administration Time: Approximately 8 to 12 minutes.

11. Permissions & Fee and Test Year

The ECOSCALE was published in 1995 by George W. Stone, James H. Barnes, and Camilla Montgomery in the peer-reviewed journal Psychology & Marketing (John Wiley & Sons, Inc.).

• Copyright Status: The conceptual model and original publication are copyrighted by John Wiley & Sons, Inc. Academic fair use allows researchers to reproduce and use the scale items for non-commercial educational and scholarly investigations, provided proper bibliographic attribution is given.
• Commercial Use: Commercial use, deployment in proprietary marketing audits, or inclusion in commercial diagnostic toolkits may require formal permission or licensing through the Copyright Clearance Center (RightsLink) via Wiley.
• Fee: The instrument is accessible without licensing fees for independent academic, university, and public policy research projects.

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
• Dunlap, R. E., Van Liere, K. D., Mertig, A. G., & Jones, R. E. (2000). New trends in measuring environmental attitudes: Measuring endorsement of the new ecological paradigm: A revised NEP scale. Journal of Social Issues, 56(3), 425–442. https://doi.org/10.1111/0022-4537.00176
• Roberts, J. A. (1996). Green consumers in the 1990s: Profile and implications for advertising. Journal of Business Research, 36(3), 217–231. https://doi.org/10.1016/0148-2963(95)00150-6
• Schwartz, S. H. (1977). Normative influences on philanthropy. In L. Berkowitz (Ed.), Advances in Experimental Social Psychology (Vol. 10, pp. 221–279). Academic Press. https://doi.org/10.1016/S0065-2601(08)60358-5
• Stern, P. C. (2000). New environmental theories: Toward a coherent theory of environmentally significant behavior. Journal of Social Issues, 56(3), 407–424. https://doi.org/10.1111/0022-4537.00175
• Stone, G., Barnes, J. H., & Montgomery, C. (1995). ECOSCALE: A scale for the measurement of environmentally responsible consumers. Psychology & Marketing, 12(7), 595–612. https://doi.org/10.1002/mar.4220120704

13. Items of the Scale