Measure of Sexual Identity Exploration and Commitment

1. Abstract

The Measure of Sexual Identity Exploration and Commitment (MoSIEC) is a multidimensional psychometric instrument developed by Roger L. Worthington, Rachel L. Navarro, Holly Bielstein Savoy, and Dustin Hampton (2008) to evaluate the developmental processes of sexual identity formation across diverse populations regardless of sexual orientation. Grounded in James Marcia's ego identity status paradigm and expanded multidimensional frameworks of sexual identity development, the MoSIEC operationalizes sexual identity beyond exclusive categorization of sexual minority status or dichotomous sexual orientation markers. The instrument comprises 22 self-report items distributed across four correlated yet distinct latent dimensions: Commitment (6 items), Exploration (8 items), Sexual Orientation Identity Uncertainty (3 items), and Synthesis/Integration (5 items). Respondents rate each item along a 6-point Likert-type response scale ranging from 1 (Very uncharacteristic of me) to 6 (Very characteristic of me).

Extensive psychometric investigations across diverse collegiate and community cohorts have established robust structural, convergent, and discriminant validity. Confirmatory factor analysis demonstrates acceptable to excellent fit indices across independent samples of heterosexual, lesbian, gay, bisexual, and questioning individuals. Internal consistency reliabilities across the four subscales consistently exceed conventional thresholds, with Cronbach's alpha coefficients typically ranging between .71 and .88, alongside demonstrated test-retest reliability across 2-week to 4-week testing intervals. The MoSIEC provides clinical practitioners, developmental psychologists, and social science researchers with a standardized, empirically validated metric to evaluate normative and minority sexual identity developmental trajectories, individual differences in sexual self-concept exploration, and personal congruence across life stages.

2. Keywords

Measure of Sexual Identity Exploration and Commitment, MoSIEC, sexual identity development, ego identity status, exploration, commitment, sexual orientation uncertainty, identity synthesis, psychometrics, developmental psychology

3. Authors

The Measure of Sexual Identity Exploration and Commitment was conceptualized, constructed, and psychometrically validated through a collaborative scholarly initiative led by experts in counseling psychology, human sexuality, and multicultural identity development:

• Roger L. Worthington, Ph.D. — Professor and former Chair of the Department of Counseling, Higher Education, and Special Education at the University of Maryland, College Park; formerly at the University of Missouri, Columbia. Recognized for seminal contributions to heterosexual identity development, multicultural counseling competencies, and social justice education. Contact: [email protected] or [email protected].
• Rachel L. Navarro, Ph.D. — Professor in Counseling Psychology, Department of Education, Health & Behavior Studies at the University of North Dakota; formerly affiliated with New Mexico State University. Specializes in vocational psychology, intersectional identity, and well-being among marginalized groups.
• Holly Bielstein Savoy, Ph.D. — Licensed Psychologist in independent practice in Charlotte, North Carolina; formerly affiliated with the University of Missouri. Specialist in developmental counseling, sexual orientation identity transitions, and psychotherapeutic interventions.
• Dustin Hampton, M.A. — Researcher and psychometric contributor formerly associated with the University of Missouri, contributing to instrument design, item construction, and data management in initial validation phases.

4. Purpose

Historically, psychological measurement of sexual identity was hindered by two principal structural constraints. First, early scales predominantly operationalized sexual identity as a categorical variable, classifying participants rigidly according to behavioral sexual orientation (e.g., exclusively heterosexual, homosexual, or bisexual) rather than capturing underlying developmental processes. Second, existing developmental scales were targeted almost exclusively toward sexual minorities undergoing the "coming out" process (e.g., gay and lesbian identity developmental phase models), thereby failing to capture sexual identity processes in heterosexual individuals or treating heterosexual identity as an unexamined developmental default.

The MoSIEC was designed to address these theoretical and empirical gaps. The scale provides a psychometrically rigorous, universal instrument capable of measuring the dynamic processes of sexual identity formation across individuals of any sexual orientation, without requiring prior disclosure of orientation. The primary clinical and research objectives of the MoSIEC include:

• Assessing Universal Identity Dynamics: Quantifying the degree to which an individual actively investigates, tests, and evaluates sexual needs, desires, and behaviors (Exploration), alongside the degree of personal allegiance and stability anchored within those dimensions (Commitment).
• Distinguishing Ambivalence from Stasis: Differentiating intentional developmental searching from disruptive or distressing ambiguity regarding sexual self-concept (Sexual Orientation Identity Uncertainty).
• Measuring Holistic Psychological Cohesion: Assessing the level of internal alignment and harmony between sexual identity and broader aspects of selfhood, including racial, cultural, spiritual, and gender identities (Synthesis/Integration).
• Empowering Clinical Assessment: Enabling psychotherapists, sex therapists, and mental health counselors to conceptualize distress related to identity ambiguity, developmental moratorium, internalized heterosexism, or lack of identity integration across diverse clients.
• Advancing Comparative and Longitudinal Research: Offering social scientists a standardized measure that operates equivalently across heterosexual and sexual minority cohorts to study how sexual identity processes intersect with psychosocial well-being, affirmative counseling competencies, health-related behaviors, and relationship satisfaction.

5. Psychological Construct

The MoSIEC evaluates sexual identity as a multidimensional, developmental, and dynamic construct. Worthington and colleagues (2002, 2008) expanded the construct of sexual identity beyond basic attraction to include perceived sexual needs, preferred sexual activities, preferred characteristics of sexual partners, sexual values, recognition and identification of sexual orientation, and preferred modes of sexual expression. The scale operationalizes these components across four distinct dimensions:

Commitment

The Commitment dimension reflects an individual's firm clarity, self-assurance, and psychosocial affirmation regarding their sexual orientation and overarching sexual self-concept. High scores characterize an individual who experiences definitive certainty, confidence, and ownership over their sexual orientation. Individuals with elevated Commitment scores report knowing their identity parameters clearly, experiencing internal security, and affirming their identity as a stable component of their social and personal reality. Conversely, low scores denote a lack of perceived permanence or a tenuous subjective grasp on one's sexual positioning.

Exploration

The Exploration subscale quantifies an individual's active, deliberate curiosity and open engagement with sexual learning, self-discovery, communication, and behavioral experimentation. It encompasses ongoing and historical efforts to discern sexual needs, articulate sexual desires, engage in discussions regarding sexual matters with peers or partners, and pursue new cognitive or interpersonal understandings of sexual selfhood. High scores represent a proactive, open orientation toward learning about oneself as an evolving sexual being, whereas low scores signify behavioral avoidance, closed attitudes toward sexual self-inquiry, or developmental stagnation.

Sexual Orientation Identity Uncertainty

The Sexual Orientation Identity Uncertainty dimension evaluates distress, confusion, and cognitive ambiguity concerning one's sexual orientation identity. While active exploration can be an adaptive, normative developmental endeavor, uncertainty represents an unresolved, disruptive state wherein an individual experiences confusion, lack of clarity, or self-doubt regarding their specific sexual attractions, classifications, and romantic inclinations. Individuals scoring high on this dimension frequently question whether they are heterosexual, gay, lesbian, bisexual, pansexual, or asexual, experiencing an ongoing, unsettled identity crisis.

Synthesis/Integration

The Synthesis/Integration subscale measures the degree to which an individual's sexual identity is holistically harmonized with other central facets of their overall identity system, including race, ethnicity, biological sex, gender expression, spirituality, and cultural worldview. Rather than compartmentalizing sexual selfhood away from public, spiritual, or familial arenas, an individual exhibiting elevated Synthesis scores experiences seamless congruence and daily authenticity. Their sexual identity fits naturally within their complete sense of personhood, reinforcing intrapsychic consistency and social integrity.

6. Theoretical Framework

The conceptual infrastructure of the MoSIEC synthesizes three foundational paradigms in personality, developmental psychology, and sexuality studies:

Marcia's Ego Identity Status Model

The primary developmental framework informing the MoSIEC is James Marcia's (1966) classic ego identity status paradigm, which translated Erik Erikson's psychosocial stage of identity versus role confusion into an empirical taxonomy. Marcia posited that identity formation progresses across two fundamental axes: exploration (the crisis or active questioning of alternative values, roles, and beliefs) and commitment (the personal investment in a specific path, ideology, or social role). Combining these axes produces four distinct identity statuses:

• Identity Diffusion: Absence of both exploration and commitment; characterized by apathy, confusion, and lack of purposeful direction.
• Foreclosure: High commitment formed without prior personal exploration; typically reflecting uncritically adopted parental or societal mandates (e.g., compulsory heterosexuality).
• Moratorium: Active exploration without established commitment; a stage of ongoing cognitive testing, seeking, and acute questioning.
• Identity Achievement: Clear, internalized commitment established following a meaningful period of personal exploration.

The MoSIEC directly adapts these theoretical parameters to the domain of sexual identity, enabling researchers to assess where an individual sits within these dynamic developmental processes.

Multidimensional Models of Sexual Minority Identity Formation

The second pillar originates from sexual minority development models, most notably the dual-phase framework introduced by Ruth Fassinger and colleagues (Fassinger & Miller, 1996; McCarn & Fassinger, 1996). Fassinger separated sexual minority development into two parallel, interacting trajectories: individual sexual identity development and group membership identity development. Both trajectories advance through four distinct phases: awareness, exploration, deepening/commitment, and internalization/synthesis. The MoSIEC operationalized these developmental constructs to ensure that sexual identity measurement captures the final phase of synthesis—where identity moves beyond private self-acceptance into comprehensive structural integration.

Multidimensional Heterosexual Identity Development Theory

Third, the scale relies heavily on the multidimensional model of heterosexual identity development conceptualized by Worthington, Savoy, Dillon, and Vernaglia (2002). Recognizing that developmental models were almost universally deployed to examine sexual minorities, Worthington and colleagues posited that heterosexual individuals likewise undergo identity development. They proposed that sexual identity encompasses six interdependent developmental arenas: sexual needs, sexual values, preferred partner characteristics, preferred sexual activities, recognition of sexual orientation, and preferred modes of sexual expression. The MoSIEC integrates these domains to create a psychometrically sound, non-stigmatizing, universal measurement tool applicable to all human sexual identities.

7. Validity

Empirical validation of the MoSIEC was conducted across multiple validation phases utilizing undergraduate and community samples, totaling well over 1,500 participants across diverse developmental stages (Worthington et al., 2008). Subsequent studies have provided robust replication and cross-validation evidence:

Construct and Factorial Validity

The underlying construct validity of the 22-item instrument was established through initial exploratory factor analysis (EFA) using principal axis factoring with oblique (Promax) rotation, which distilled an initial 48-item conceptual pool down to four clean, non-redundant factors. Subsequent confirmatory factor analyses (CFA) across diverse, independent validation samples confirmed that the four-factor oblique model exhibited superior fit relative to rival unidimensional, orthogonal, or two-factor models.

Convergent Validity

Convergent validity was demonstrated through statistically significant associations with established psychological constructs in theoretically predicted directions:

• Exploration was positively correlated with sexual self-awareness, sexual communication openness, broad personality openness to experience, and progressive attitudes toward lesbian, gay, and bisexual civil rights.
• Commitment and Synthesis/Integration were positively correlated with measures of global self-esteem, psychological well-being, emotional stability, and identity cohesion.
• Sexual Orientation Identity Uncertainty was positively correlated with psychological distress, generalized anxiety, internalized heterosexism in sexual minorities, and overall identity ambiguity, while demonstrating negative correlations with life satisfaction and commitment.

Discriminant and Criterion-Related Validity

The scale effectively discriminates between known groups. Worthington and Reynolds (2009) demonstrated that the four MoSIEC subscales reliably differentiated individuals based on self-reported sexual orientation and developmental milestone timing. Heterosexual individuals exhibiting unexamined heterosexuality scored high on Commitment but significantly lower on Exploration and Uncertainty. Conversely, individuals actively in the process of coming out or questioning their orientation scored significantly higher on Sexual Orientation Identity Uncertainty and Exploration. Furthermore, Dillon et al. (2008) demonstrated criterion validity by revealing that counselors' scores on the Exploration and Synthesis subscales significantly predicted self-efficacy in lesbian, gay, and bisexual (LGB) affirmative counseling, explaining variance beyond standard multicultural counseling training.

8. Reliability

The MoSIEC demonstrates strong psychometric reliability across internal consistency and temporal stability metrics:

Internal Consistency

Across the initial validation samples reported by Worthington et al. (2008) and replicated in subsequent empirical investigations (e.g., Dillon et al., 2008; Worthington & Reynolds, 2009), the four subscales have demonstrated strong Cronbach's alpha coefficients:

• Commitment (6 items): $\alpha$ ranges between .82 and .88 across diverse demographic samples, demonstrating high internal homogeneity.
• Exploration (8 items): $\alpha$ consistently ranges from .78 to .84, reflecting balanced measurement of behavioral experimentation and informational inquiry.
• Sexual Orientation Identity Uncertainty (3 items): $\alpha$ ranges from .71 to .81, which is notably robust for a brief 3-item subscale.
• Synthesis/Integration (5 items): $\alpha$ ranges from .74 to .83, indicating high internal coherence across items evaluating cross-domain identity alignment.

Test-Retest Reliability and Temporal Stability

Temporal stability was evaluated across a 2-week to 4-week interval among non-clinical participants (Worthington et al., 2008). Pearson correlation coefficients ($r$) for test-retest reliability across all four subscales exceeded .75 (ranging from .76 to .86), indicating that while sexual identity remains open to developmental maturation over extended periods, the MoSIEC captures stable personal orientations rather than transient situational fluctuations.

9. Factor Analysis

The structural composition of the MoSIEC was rigorously established through sequential Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) protocols during its scale development:

Exploratory Factor Analysis (EFA)

During initial instrument development, an exploratory pool of 48 items was administered to an initial developmental sample of 417 college students. Principal axis factoring with oblique rotation was implemented due to theoretical expectations that developmental dimensions of identity would correlate. Examination of the scree plot, eigenvalues (> 1.0), and item factor matrices indicated a clear four-factor structure. Twenty-six items were eliminated sequentially due to low primary loadings (< .40), significant cross-loadings (> .30 on secondary factors), or conceptual redundancy. The final 22-item configuration accounted for substantial common variance, yielding four cleanly separated, interpretable factors with primary loadings ranging between .45 and .86.

Confirmatory Factor Analysis (CFA) Fit Indices

To cross-validate the four-factor structural solution, CFA was performed across two independent cross-validation cohorts (Sample 1: $N = 432$; Sample 2: $N = 412$). Robust maximum likelihood estimation was employed. The hypothesized four-factor model demonstrated excellent fit across conventional goodness-of-fit metrics, significantly outperforming alternative models:

• Comparative Fit Index (CFI): .93 to .96 across validation cohorts (exceeding the standard $ge .90$ criterion).
• Tucker-Lewis Index (TLI): .92 to .95, confirming robust parsimonious fit.
• Root Mean Square Error of Approximation (RMSEA): .048 to .056 (with 90% confidence intervals between .041 and .062), satisfying the benchmark for close model fit ($< .06$).
• Standardized Root Mean Square Residual (SRMR): .045 to .052, demonstrating minimal residual covariance.

Multigroup CFA further confirmed metric and scalar invariance across biological sex (men vs. women) and broad sexual orientation cohorts, confirming that items functioned equivalently across diverse participant groups.

10. Instrument / Measurement Tool

• Instrument Name: Measure of Sexual Identity Exploration and Commitment (MoSIEC)
• Item Count: 22 items
• Subscale Structure:
  • Commitment: 6 items (Items 2, 4, 7, 10, 15, 20)
  • Exploration: 8 items (Items 5, 8, 9, 13, 16, 17, 19, 21)
  • Sexual Orientation Identity Uncertainty: 3 items (Items 1, 3, 12)
  • Synthesis/Integration: 5 items (Items 6, 11, 14, 18, 22)
• Response Format: 6-point Likert-type scale:
  • 1 = Very uncharacteristic of me
  • 2 = Moderately uncharacteristic of me
  • 3 = Slightly uncharacteristic of me
  • 4 = Slightly characteristic of me
  • 5 = Moderately characteristic of me
  • 6 = Very characteristic of me
• Administration Time: Approximately 8 to 12 minutes
• Scoring Procedures:
  • No items are reverse-scored in the finalized 22-item authentic published scoring structure.
  • Subscale scores are calculated by computing the unweighted arithmetic mean of the items comprising each subscale.
  • Subscale scores range from 1.00 to 6.00, where higher scores represent greater levels of that specific developmental dimension.
  • No single overall total score is computed, as the dimensions represent distinct, non-hierarchical developmental axes.

11. Permissions & Fee and Test Year

The Measure of Sexual Identity Exploration and Commitment was published in 2008 by the American Psychological Association (APA) in Developmental Psychology (Worthington et al., 2008). The instrument is considered open-access for non-commercial academic research, educational instruction, and clinical training purposes, provided that appropriate scholarly attribution and citation are given. Commercial applications, corporate consulting, or inclusion in paid digital health systems require explicit copyright clearance and licensing permissions from the primary copyright holder (American Psychological Association) and the corresponding author, Dr. Roger L. Worthington.

12. References

• Dillon, F. R., Worthington, R. L., Soth-McNett, A. M., & Schwartz, S. J. (2008). Gender and sexual identity based predictors of lesbian, gay, and bisexual affirmative counseling self-efficacy. Professional Psychology: Research and Practice, 39(3), 353–360. https://doi.org/10.1037/0735-7028.39.3.353
• Fassinger, R. E., & Miller, B. A. (1996). Validation of an inclusive model of sexual minority identity formation on a sample of gay men. Journal of Homosexuality, 32(2), 53–78. https://doi.org/10.1300/J082v32n02_04
• Marcia, J. E. (1966). Development and validation of ego-identity status. Journal of Personality and Social Psychology, 3(5), 551–558. https://doi.org/10.1037/h0023281
• McCarn, S. R., & Fassinger, R. E. (1996). Revisioning sexual minority identity formation: A new model of lesbian identity and its implications for counseling and research. The Counseling Psychologist, 24(3), 508–534. https://doi.org/10.1177/0011000096243011
• Worthington, R. L., Dillon, F. R., & Becker-Schutte, A. M. (2005). Development, reliability, and validity of the LGB Knowledge and Attitudes Scale for Heterosexuals (LGB-KASH). Journal of Counseling Psychology, 52(1), 104–118. https://doi.org/10.1037/0022-0167.52.1.104
• Worthington, R. L., Navarro, R. L., Savoy, H. B., & Hampton, D. (2008). Development, reliability, and validity of the Measure of Sexual Identity Exploration and Commitment (MoSIEC). Developmental Psychology, 44(1), 22–33. https://doi.org/10.1037/0012-1649.44.1.22
• Worthington, R. L., & Reynolds, A. L. (2009). Within-group differences in sexual orientation and identity. Journal of Counseling Psychology, 56(1), 44–55. https://doi.org/10.1037/a0013753
• Worthington, R. L., Savoy, H. B., Dillon, F. R., & Vernaglia, E. R. (2002). Heterosexual identity development: A multidimensional model of individual and group identity. The Counseling Psychologist, 30(4), 496–531. https://doi.org/10.1177/0011000002304002

13. Items of the Scale (Questionnaire)