The Social Dominance Orientation Scale (SDO7)<\/strong>, developed by Ho et al. (2015)<\/a>, represents a major theoretical and psychometric advancement in the measurement of individual preferences for group-based hierarchy and social inequality. Rooted in Social Dominance Theory<\/a> (SDT), the instrument operationalizes social dominance orientation not as a unitary, monolithic construct, but as a dual-dimensional disposition comprising two distinct, positively correlated subdimensions: SDO-Dominance (SDO-D)<\/strong> and SDO-Anti-egalitarianism (SDO-E)<\/strong>. SDO-Dominance reflects support for overt, aggressive, and coercive group-based dominance\u2014a worldview where dominant groups actively oppress and subjugate subordinate groups. Conversely, SDO-Anti-egalitarianism reflects a preference for subtle, structural, and institutional inequality, characterized by an explicit opposition to equality, inclusive social policies, and the redistribution of societal resources.<\/p>\n The standard full-length SDO7 scale comprises 16 items balanced equally between pro-trait and con-trait statements across both dimensions (eight items measuring SDO-D and eight items measuring SDO-E), evaluated using an authentic 7-point Likert response scale ranging from 1 (“Strongly Oppose”) to 7 (“Strongly Favor”). Extensive empirical evaluations across diverse international cohorts\u2014including representative community, undergraduate, and cross-national samples in the United States, Israel, and the United Kingdom\u2014confirm that SDO7 possesses robust psychometric properties. Confirmatory factor analyses consistently demonstrate that the two-factor oblique model and bifactor structures fit empirical data significantly better than traditional unidimensional specifications (such as the earlier SDO6 scale). Both subscales exhibit high internal consistency (Cronbach\u2019s alpha<\/a> typically ranging from .82 to .93), exceptional longitudinal test-retest stability, and distinct predictive validity profiles. SDO-D specifically accounts for active, hostile intergroup phenomena (e.g., support for aggressive foreign policy, police brutality, intergroup persecution), whereas SDO-E uniquely predicts opposition to affirmative action, egalitarian resource allocation, welfare policies, and inclusive marketing initiatives. As such, the SDO7 scale serves as an essential psychometric instrument across political psychology, organizational sociology, intergroup relations, consumer research, and behavioral economics.<\/p>\n Social Dominance Orientation, SDO7, Social Dominance Theory, Intergroup Relations, SDO-Dominance, SDO-Anti-egalitarianism, Group-Based Hierarchy, Prejudice, System Justification, Discrimination, Psychometrics, Scale Validation<\/p>\n The SDO7 scale was developed, validated, and published by a collaborative team of leading researchers in social psychology and intergroup conflict:<\/p>\n Corresponding inquiries regarding the theoretical development and psychometric modeling of the SDO7 scale are typically directed to the Department of Psychology at the University of Michigan or the Department of Psychological Sciences at the University of Connecticut.<\/p>\n The principal purpose of the Social Dominance Orientation Scale (SDO7) is to provide an empirically refined, psychometrically balanced measurement of an individual\u2019s psychological propensity toward group-based inequality and hierarchy. Within the social sciences, measuring attitudes toward social hierarchy has historically been confounded by measurement artifacts, including acquiescence response bias, unifactorial oversimplification, and collinearity between aggressive dominance and passive resistance to equality. Previous iterations of the scale, most notably the 16-item SDO6 scale (Pratto et al., 1994<\/a>), treated social dominance orientation as a single global dimension, despite recurrent psychometric observations that the scale contained distinct factor clusters reflecting overt intergroup dominance versus passive resistance to equality.<\/p>\n The SDO7 was intentionally constructed to achieve three critical scientific and applied objectives:<\/p>\n Furthermore, in consumer behavior and inclusive marketing research, the SDO7 scale has emerged as a key moderating variable. Research reveals that an individual’s level of SDO determines their affective and behavioral responses to inclusive advertising, brand positioning supporting marginalized populations (e.g., LGBTQ+ campaigns, racial diversity in leadership), and corporate social responsibility programs. Consumers high in SDO demonstrate marked backlash against brands that violate traditional social hierarchies, making the scale indispensable for understanding ideological segmentation in modern markets.<\/p>\n Social Dominance Orientation (SDO) represents an individual\u2019s general attitudinal orientation toward intergroup relations, specifically reflecting whether one prefers social systems to be organized hierarchically (such that superior groups dominate inferior groups) or egalitarily (such that all social groups possess equal power, status, and material conditions). In the SDO7 operationalization, this overarching disposition is decomposed into two interrelated yet functionally divergent psychological constructs:<\/p>\n SDO-Dominance<\/strong> captures an active preference for overt, coercive, and hierarchical relations between social groups. It is grounded in a social-Darwinian or competitive-jungle worldview, wherein the social sphere is perceived as an inherently zero-sum battleground of survival. Individuals scoring high in SDO-D endorse the premise that dominant groups ought to proactively exercise power, enforce subjugation, and maintain lower-status groups “in their place” through force or active disenfranchisement.<\/p>\n Psychologically, SDO-D is characterized by:<\/p>\n SDO-Anti-egalitarianism<\/strong> represents a preference for unequal intergroup relations maintained through subtle, institutionalized, and non-coercive means, primarily manifested as an ideological opposition to equality. Rather than actively seeking to crush or oppress subordinate groups through direct aggression, an individual high in SDO-E objects to measures, programs, or philosophical ideals designed to equalize status, wealth, or opportunities across groups.<\/p>\n Psychologically, SDO-E is characterized by:<\/p>\n A vital psychometric characteristic of both SDO-D and SDO-E within the SDO7 is the inclusion of balanced item framing. Pro-trait items measure direct agreement with dominance or anti-egalitarian principles, whereas con-trait items express pro-egalitarianism or anti-dominance principles (which are reverse-scored). This balanced structure ensures that the resultant scores reflect genuine ideological commitments rather than generalized acquiescence or cognitive processing biases.<\/p>\n The theoretical bedrock of the SDO7 scale is Social Dominance Theory (SDT)<\/strong>, first articulated by Jim Sidanius<\/a> and Felicia Pratto<\/a> (1999). SDT represents a comprehensive, multi-level bio-psycho-social framework that seeks to understand how group-based social hierarchies are produced, preserved, and structurally reinforced across human civilizations.<\/p>\n SDT postulates that all human societies capable of generating economic surplus inevitably organize themselves into group-based social hierarchies. These hierarchies consist of at least one hegemonic, dominant group possessing disproportionate shares of “positive social value” (e.g., wealth, political power, legal protection, healthcare, quality education) and subordinate groups bearing disproportionate burdens of “negative social value” (e.g., poverty, incarceration, disease, physical violence). Social hierarchies are typically organized around three distinct systems:<\/p>\n According to SDT, societal stability in the face of massive inequality is maintained through widely shared cultural ideologies termed legitimizing myths<\/strong>:<\/p>\n The development of the SDO7 refined SDT by demonstrating that hierarchy maintenance operates via two distinct psychological engines. While earlier formulations viewed SDO primarily as a generalized drive for inequality, Ho et al. (2015)<\/a> proved that social dominance is maintained both through aggressive conquest (SDO-D) and institutional preservation (SDO-E). This differentiation corresponds directly to classic socio-evolutionary and sociological distinctions between violent coercion (despotism) and systemic exclusion (hegemony).<\/p>\n The SDO7 scale has undergone rigorous empirical validation across multiple cross-sectional, longitudinal, and experimental designs involving thousands of participants across diverse cultural contexts.<\/p>\n Structural validity was established by comparing competing factor models via confirmatory factor analysis (CFA). In the seminal validation studies by Ho et al. (2015), the hypothesized two-factor oblique model (SDO-D and SDO-E) demonstrated superior fit indices compared to a unidimensional model across independent samples of American undergraduates, U.S. national adults, British adults, and Israeli Jews. Specifically, the two-factor model yielded non-significant chi-square contributions or superior practical fit indices (CFI<\/a> > .95, RMSEA<\/a> < .06). Furthermore, a bifactor model\u2014incorporating a general SDO dimension alongside specific SDO-D and SDO-E orthogonal sub-factors\u2014also confirmed the presence of both broad shared variance and clinically meaningful sub-dimensional specificity<\/span>.<\/p>\n SDO7 demonstrates robust convergent validity with theoretically aligned constructs while remaining empirically distinct from related ideological measures:<\/p>\n The primary psychometric justification for the SDO7 scale lies in the distinctive predictive validity profiles of its two subdimensions. Through multivariate structural equation modeling and regression analyses, Ho et al. (2015) confirmed that SDO-D and SDO-E uniquely predict divergent social, political, and consumer outcomes:<\/p>\n These findings demonstrate that SDO-E accounts for policy resistance even when individuals display no overt hostility, whereas SDO-D accounts for active, punitive intergroup violence.<\/p>\n The SDO7 scale consistently exhibits exemplary internal consistency and temporal stability across diverse participant populations, language adaptations, and cultural settings.<\/p>\n Extensive psychometric evaluations by Ho et al. (2015) and subsequent independent replications across social science literature indicate that the 16-item full-scale SDO7, as well as its two 8-item subscales, possess exceptional internal reliability:<\/p>\n Longitudinal assessments confirm that Social Dominance Orientation, as measured by SDO7, behaves as a stable personality-like ideological trait. In longitudinal panel studies spanning periods ranging from several weeks to multiple months, test-retest reliability coefficients ($r_{tt}$<\/span>) consistently range between .75 and .86 for both the composite score and the individual subdimensions, indicating that baseline hierarchy preferences remain highly stable over time in the absence of major macro-societal disruptions.<\/p>\n The internal structural validity of the SDO7 scale was established through rigorous exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) during its psychometric construction. Historical iterations of the scale, such as the SDO6, frequently produced two factors upon EFA, which were often discounted by psychometricians as methodological artifacts resulting from the unbalanced grouping of positively and negatively worded statements (the so-called “wording effects”).<\/p>\n To definitively untangle substantive theoretical factors from wording artifacts, Ho et al. (2015) utilized multi-group structural equation modeling incorporating both trait factors (Dominance and Anti-egalitarianism) and method factors (pro-trait and con-trait item format). The results unequivocally supported the theoretical two-dimensional model:<\/p>\n When subjected to bifactor modeling, a strong general SDO factor accounts for the majority of the common variance (explained common variance, ECV > .60), supporting the calculation of a single overall composite SDO score when broad measurement is required. However, the specific orthogonal factors for SDO-D and SDO-E retain sufficient independent reliable variance to warrant independent subscale scoring, especially when investigating differential predictive targets (e.g., active violence versus policy obstruction)<\/span>.<\/p>\n The Social Dominance Orientation Scale (SDO7) was published in 2015<\/strong> in the Journal of Personality and Social Psychology<\/em> by Arnold K. Ho and colleagues. The scale was developed with academic research support and is considered in the public domain for non-commercial academic, educational, and basic research applications.<\/p>\n No licensing fees or formal permissions are required for non-commercial empirical use by university scholars, students, or institutional researchers, provided that standard academic attribution is given to the original authors (Ho et al., 2015<\/a>). Commercial entities, private consulting agencies, or corporate entities intending to integrate the SDO7 into proprietary psychological assessment suites or commercial software should consult the copyright policies of the American Psychological Association (APA) and the corresponding authors.<\/p>\n The following foundational publications provide theoretical, psychometric, and empirical background for the SDO7 scale:<\/p>\n Response Scale:<\/strong> 7-point Likert scale (1 = Strongly Oppose, 7 = Strongly Favor)<\/span><\/p>\n Instructions:<\/strong> Show how much you favor or oppose each idea below by selecting a number from 1 to 7 on the scale.<\/p>\n A comprehensive academic guide to the Social Dominance Orientation Scale (SDO7), examining its theoretical framework, dual-dimensional structure (Dominance and Anti-egalitarianism), psychometric validity, reliability, and full 16-item measurement instrument.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","categories":[858,2,79],"tags":[4084,304,4085,6,4083,3847,3850],"class_list":["post-957","psych_scale","type-psych_scale","status-publish","hentry","category-personality-assessment","category-psychometrics","category-social-psychology","tag-hierarchy","tag-intergroup-relations","tag-prejudice","tag-psychometrics","tag-sdo7","tag-social-dominance-orientation","tag-social-dominance-theory"],"_links":{"self":[{"href":"https:\/\/ashadocs.org\/index.php?rest_route=\/wp\/v2\/psych_scale\/957","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ashadocs.org\/index.php?rest_route=\/wp\/v2\/psych_scale"}],"about":[{"href":"https:\/\/ashadocs.org\/index.php?rest_route=\/wp\/v2\/types\/psych_scale"}],"author":[{"embeddable":true,"href":"https:\/\/ashadocs.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ashadocs.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=957"}],"version-history":[{"count":0,"href":"https:\/\/ashadocs.org\/index.php?rest_route=\/wp\/v2\/psych_scale\/957\/revisions"}],"wp:attachment":[{"href":"https:\/\/ashadocs.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ashadocs.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ashadocs.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Keywords<\/h2>\n
Authors<\/h2>\n
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Purpose<\/h2>\n
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Psychological Construct<\/h2>\n
1. SDO-Dominance (SDO-D)<\/h3>\n
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2. SDO-Anti-egalitarianism (SDO-E)<\/h3>\n
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The Balanced Pro- and Con-Trait Architecture<\/h3>\n
Theoretical Framework<\/h2>\n
Core Assumptions of Social Dominance Theory<\/h3>\n
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Legitimizing Myths: Hierarchy-Enhancing vs. Hierarchy-Attenuating<\/h3>\n
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The Dual-Engine Model of SDO within SDT<\/h3>\n
Validity<\/h2>\n
Construct and Structural Validity<\/h3>\n
Convergent and Discriminant Validity<\/h3>\n
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Predictive and Incremental Predictive Validity<\/h3>\n
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Reliability<\/h2>\n
Internal Consistency<\/h3>\n
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Test-Retest Stability<\/h3>\n
Factor Analysis<\/h2>\n
Confirmatory Factor Analytic Results<\/h3>\n
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Bifactor Modeling<\/h3>\n
Instrument \/ Measurement Tool<\/h2>\n
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Permissions & Fee and Test Year<\/h2>\n
References<\/h2>\n
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Items of the Scale<\/h2>\n
Subscale 1: SDO-Dominance (SDO-D)<\/h3>\n
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Subscale 2: SDO-Anti-egalitarianism (SDO-E)<\/h3>\n
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