Psychological Well-Being Scales (PWB)

Abstract

The Psychological Well-Being Scales (PWB), developed by developmental and personality psychologist Carol D. Ryff in 1989, represent one of the most theoretically grounded and empirically scrutinized assessment instruments in contemporary psychometrics, positive psychology, and life-course epidemiology. Formulated as a direct conceptual counterpoint to hedonic paradigms that equate subjective wellbeing with positive affect, low negative affect, and life satisfaction, the PWB operationalizes eudaimonic wellbeing—defined as the realization of personal potential, self-actualization, purposeful engagement, and existential fulfillment. Grounded in an integrative synthesis of clinical, developmental, humanistic, and existential theories (including the foundational contributions of Erik Erikson, Abraham Maslow, Carl Rogers, Gordon Allport, and Aristotle), the instrument captures six distinct dimensions of optimal psychological functioning: Autonomy, Environmental Mastery, Personal Growth, Positive Relations with Others, Purpose in Life, and Self-Acceptance.

The original operationalization comprised an extensive 120-item instrument (20 items per subscale), subsequently refined into psychometrically validated parent versions of 84 items (14 items per subscale), 54 items (9 items per subscale), 42 items (7 items per subscale), and an ultra-brief 18-item short form (3 items per subscale) optimized for large-scale epidemiological investigations, including the landmark Midlife in the United States (MIDUS) national longitudinal cohort. Respondents evaluate each statement across a 6-point Likert response format ranging from 1 (Strongly disagree) to 6 (Strongly agree). The scales demonstrate well-documented construct validity, longitudinal stability, and inverse associations with biological markers of allostatic load, neuroendocrine dysregulation, systemic inflammation (e.g., interleukin-6, C-reactive protein), and cardiovascular risk. This comprehensive psychometric review delineates the historical development, theoretical foundations, architectural dimensions, structural validity debates, internal consistency metrics, clinical and epidemiological applications, and scoring standards of Ryff’s multidimensional model.

Keywords

Psychological Well-Being Scales, Carol Ryff, eudaimonic wellbeing, positive psychology, autonomy, environmental mastery, personal growth, positive relations with others, purpose in life, self-acceptance, psychometric evaluation, MIDUS study, factor structure, eudaimonia.

Authors

The Psychological Well-Being Scales were formulated, validated, and continuously refined by Carol D. Ryff, Ph.D., Hilldale Professor of Psychology and Director of the Institute on Aging at the University of Wisconsin–Madison. Ryff received her doctorate in developmental psychology from The Pennsylvania State University in 1978 and dedicated her academic career to exploring the interfaces between socio-demographic factors, personality dynamics, psychological functioning, existential health, and neurobiological pathways in adult development and aging.

Her theoretical program emerged in response to the historical bias within clinical psychology and psychiatry toward psychopathology, psychic distress, and symptomatic impairment, combined with the reductionism of subjective wellbeing research focused exclusively on hedonic pleasure. Collaborating across decades with prominent methodological, sociological, and biomedical scientists—including Burton H. Singer, Corey Lee M. Keyes, Jennifer Morozink Boylan, and Christopher L. Coe—Ryff positioned the PWB framework at the center of biopsychosocial research. Inquiries regarding scale usage, licensing protocols, data archives, and translation clearances are hosted through the Institute on Aging, University of Wisconsin–Madison, 2245 Medical Sciences Center, 1300 University Avenue, Madison, WI 53706, United States.

Purpose

The primary purpose of the Psychological Well-Being Scales is to provide a theoretically deduced, psychometrically robust measurement framework capable of evaluating human flourishing, positive psychological functioning, and existential fulfillment across the adult lifespan. Throughout the latter half of the twentieth century, empirical investigations into human wellbeing were overwhelmingly dominated by hedonic models—most prominently conceptualized through operationalizations of subjective well-being (SWB) such as Ed Diener’s Satisfaction With Life Scale (SWLS) and Bradburn’s Affect Balance Scale. While hedonic indices capture immediate cognitive-affective evaluations of life happiness and emotional valence, they routinely fail to address whether an individual is experiencing deeper existential growth, purposeful engagement, psychological autonomy, and self-realization.

Ryff recognized that the absence of psychological illness or depressive symptomatology does not equate to the presence of positive mental health. Conversely, experiencing episodic negative affect or psychological friction does not inherently undermine a deeply purposeful, autonomous, and self-actualizing existence. The PWB was constructed to systematically evaluate these complex existential realities. By decoupling wellbeing from momentary happiness or societal compliance, the scale assesses the degree to which an individual negotiates existential challenges: establishing an internal locus of evaluation, mastering surrounding complex environments, sustaining reciprocal interpersonal trust, maintaining a coherent trajectory of self-actualization, pursuing meaningful life aims, and maintaining comprehensive self-acceptance inclusive of past developmental liabilities.

In clinical, counseling, and psychiatric domains, the PWB serves an essential diagnostic and therapeutic role. It operationalizes positive mental health within psychotherapeutic interventions—most notably exemplified by Giovanni Fava’s Well-Being Therapy (WBT), an evidence-based cognitive-behavioral approach structured specifically around Ryff’s six dimensions to prevent relapse in recurrent affective and anxiety disorders. Clinicians utilize profile analyses across the six subscales to identify specific vulnerabilities (such as high environmental mastery coupled with low purpose in life, or elevated autonomy paired with impoverished interpersonal relations) that standard depression and anxiety inventories overlook.

In epidemiological and biomedical research, the PWB is deployed as a critical psychosocial predictor and moderator of physiological resilience and physical health outcomes. Cross-sectional and longitudinal data derived from national probability samples—such as the MIDUS study in the United States, the English Longitudinal Study of Ageing (ELSA), and the Japanese Midlife Development Study (MIDJA)—have established that individuals scoring high on eudaimonic dimensions exhibit favorable allostatic load profiles, including suppressed nocturnal cortisol excretion, decreased plasma soluble adhesion molecules, attenuated pro-inflammatory cytokine expression (interleukin-6, soluble IL-6 receptor, C-reactive protein), enhanced natural killer cell cytotoxicity, reduced risk of metabolic syndrome, superior glycemic control among type 2 diabetics, improved sleep architecture (e.g., longer REM duration and shorter sleep onset latency), and lower cardiovascular and all-cause mortality.

Psychological Construct

The psychological construct evaluated by the PWB is multidimensional eudaimonic wellbeing. Rather than treating wellbeing as a monolithic global attribute, Ryff posited that optimal functioning represents an integrated constellation of six interrelated yet conceptually discrete existential competencies. Each dimension captures an essential component of positive psychological health:

1. Autonomy

Autonomy encompasses self-determination, personal independence, internal regulation of behavior, and resistance to enculturation. High scorers possess an internal locus of evaluation; they evaluate themselves according to personal standards, demonstrate psychological independence, and resist social pressures to think, feel, or act in specific ways. Conversely, individuals scoring low on autonomy display extreme vulnerability to interpersonal expectations, conform excessively to collective norms, rely heavily on the judgments of others to guide fundamental life decisions, and lack the internal fortitude to maintain dissenting opinions in the face of social consensus.

2. Environmental Mastery

Environmental Mastery refers to an individual’s competence in negotiating, managing, and shaping their external environment. This construct extends beyond passive adaptation; it involves the active capacity to select, create, and sustain contextual environments suited to personal psychological needs, values, and developmental capacities. High scorers exhibit a profound sense of agency in directing daily affairs, leveraging ambient opportunities, and orchestrating complex exterior situations. Low scorers report feelings of being overwhelmed by everyday responsibilities, difficulty managing daily activities, powerlessness to alter unfulfilling domestic or occupational settings, and an inability to recognize or exploit contextual opportunities.

3. Personal Growth

Personal Growth assesses the ongoing realization of latent talents and capacities, openness to novel experiences, and a sustained trajectory of developmental self-expansion. Rooted deeply in Rogers’ formulation of the “fully functioning person” and Maslow’s theory of self-actualization, this dimension reflects an individual’s orientation toward viewing life as a dynamic, continuous process of learning and unfolding. High scorers continually seek challenging experiences, perceive improvement in self and behavior over time, and demonstrate dynamic adaptability. Low scorers experience developmental stagnation, report feelings of personal boredom or apathy, lack curiosity, and express a fixed sense of self that resists behavioral modification or cognitive expansion.

4. Positive Relations with Others

Positive Relations with Others measures the capacity for deep, trusting, empathetic, and reciprocal interpersonal connections. This dimension emphasizes the quality of human attachment, interpersonal warmth, compassion, and emotional intimacy. High scorers are capable of strong empathy, understand the give-and-take dynamics of authentic partnership, experience genuine affection, and maintain deep friendships. Low scorers report profound social isolation, chronic frustration in establishing or sustaining interpersonal intimacy, difficulties with emotional openness, and an unwillingness to make compromises necessary to maintain meaningful human connections.

5. Purpose in Life

Purpose in Life evaluates the presence of overarching directedness, intentionality, existential meaning, and intentional goals. Drawing from Frankl’s logotherapy and developmental life-span theory, this dimension captures whether an individual experiences their existence as having significance, coherence, and forward momentum. High scorers possess clear goals, a definitive sense of direction, and an overarching narrative that gives past, present, and anticipated future struggles meaning. Low scorers express existential frustration, view daily living as aimless and routine, experience an absence of unifying objectives, and report having few beliefs or convictions that provide an animating rationale for living.

6. Self-Acceptance

Self-Acceptance represents a comprehensive, non-defensive awareness and acceptance of oneself, encompassing both positive attributes and developmental liabilities. Far broader than self-esteem—which often relies on continuous social validation, comparative superiority, and external accolades—self-acceptance involves a positive attitude toward the self grounded in realistic appraisal and the integration of one’s personal history. High scorers accept their strengths and limitations, feel pleased with their life trajectory, and harbor positive feelings about who they are. Low scorers suffer from pervasive self-dissatisfaction, harbor deep regrets about past biographical events, struggle with persistent feelings of inadequacy, and wish they were fundamentally different from who they are.

Theoretical Framework

The theoretical architecture of the Psychological Well-Being Scales was explicitly engineered to address a profound epistemological gap in 20th-century psychological science. Prior to Ryff’s seminal 1989 formulation, the operationalization of wellbeing was primarily empirical rather than theoretical. Sociological surveys and market research instruments measured happiness through ad-hoc, single-item questions regarding life satisfaction or affective valence without rooting these inquiries in systematic developmental, clinical, or philosophical traditions.

Ryff addressed this deficiency by conducting an extensive comparative analysis across developmental, clinical, and humanistic theories of optimal human functioning. She observed that across disparate theoretical paradigms, prominent theorists had independently arrived at convergent definitions of psychological maturity, health, and individuation:

• Humanistic and Clinical Formulations: Carl Rogers formulated the characteristics of the “fully functioning person,” highlighting openness to experience, an internal locus of evaluation, and unconditional positive self-regard. Abraham Maslow mapped the characteristics of “self-actualizing” individuals, documenting their deep interpersonal relations, peak experiences, autonomy, and problem-centering orientation. Gordon Allport articulated criteria for psychological maturity, emphasizing the extension of the sense of self, warm relating to others, and a unifying philosophy of life.
• Developmental and Life-Span Models: Erik Erikson‘s epigenetic model of psychosocial stages described sequential developmental tasks across the adult lifespan, including the attainment of intimacy versus isolation, generativity versus stagnation, and ego integrity versus despair. Charlotte Bühler’s basic life tendencies focused on intentional goal fulfillment, life-expanding fulfillment, and integrative self-assessment. Bernice Neugarten examined executive processes of personality, adaptation to age-graded life events, and self-interiority in midlife and older adulthood.
• Existential and Philosophical Traditions: Ryff anchored these psychological theories within classical Aristotelian philosophy, particularly the concept of eudaimonia articulated in the Nicomachean Ethics. Aristotle argued that true wellbeing is not synonymous with bodily pleasure, sensory gratification, or wealth (hedonia), but is achieved through the ethical, intellectual, and purposive realization of an individual’s highest daemon (true self or inherent potential). This existential perspective was complemented by Viktor Frankl’s logotherapeutic emphasis on the “will to meaning” as the foundational drive of human survival and mental health.

By mapping the structural overlaps among these foundational frameworks, Ryff distilled six invariant conceptual dimensions. Each dimension reflects a point of theoretical convergence across these disparate clinical, developmental, and existential models, providing the PWB with deep theoretical foundation and broad construct coverage.

Validity

The construct, convergent, discriminant, and criterion-related validity of the Psychological Well-Being Scales has been documented across three decades of psychometric, epidemiological, and cross-cultural evaluation.

Construct and Convergent Validity

In her foundational 1989 validation investigation involving 321 young, middle-aged, and older adults, Ryff administered the 120-item PWB alongside established inventories of subjective wellbeing, life satisfaction, depressive affect, self-esteem, locus of control, and personality. The convergent patterns strongly validated the theoretical propositions:

• Self-Acceptance and Environmental Mastery exhibited substantial positive correlations with established indices of positive functioning, such as the Rosenberg Self-Esteem Scale (r = .73 and r = .73, respectively) and the Life Satisfaction Index (r = .73 and r = .72).
• Positive Relations with Others correlated strongly with the Positive Affect subscale of Bradburn’s Affect Balance Scale (r = .47) and correlated negatively with loneliness measures.
• Personal Growth and Purpose in Life demonstrated unique convergent associations with scales assessing self-actualization (Jones and Crandall Self-Actualization Scale, r = .40 to .57), openness to experience, and intrinsic motivation.

Discriminant Validity

Discriminant validity analyses confirmed that the PWB dimensions captured psychological phenomena distinct from conventional affective and personality measures. While Self-Acceptance and Environmental Mastery shared significant variance with self-esteem and happiness inventories, Autonomy, Personal Growth, and Purpose in Life showed moderate to weak correlations with standard hedonic markers (correlations ranging from .25 to .45), demonstrating that high eudaimonic functioning frequently diverges from simple mood states. Furthermore, all six dimensions demonstrated consistent negative correlations with standard depression inventories (e.g., Zung Self-Rating Depression Scale, r = -.30 to -.60), proving that eudaimonic wellness actively buffers against, rather than merely reflects the absence of, depressive symptoms.

Longitudinal and Criterion Validity

The predictive and criterion-related validity of the scale has been corroborated through prospective longitudinal studies utilizing the MIDUS cohort and international datasets. High baseline scores on Purpose in Life and Personal Growth prospectively predict lower all-cause mortality, reduced incidence of stroke and myocardial infarction, enhanced cognitive reserve against Alzheimer’s neuropathology, and decreased hospital readmission rates among older adults. In clinical trials evaluating Well-Being Therapy (WBT), significant longitudinal elevations across the six PWB dimensions have consistently predicted reduced relapse rates in individuals recovering from major depressive disorder and generalized anxiety disorder compared to standard maintenance pharmacotherapy.

Reliability

The internal consistency and temporal stability of the Psychological Well-Being Scales vary systematically as a function of scale length. Psychometric evaluations confirm that the longer versions (84-item, 54-item, and 42-item) possess excellent internal reliability and test-retest stability, whereas the abbreviated 18-item short form exhibits lower internal consistency—a recognized psychometric trade-off resulting from retaining only three items per subscale to optimize brevity in large epidemiological batteries.

Internal Consistency (Cronbach’s Alpha)

• Original 120-Item Version (20 items/subscale): Demonstrates exceptional internal consistency across all dimensions: Autonomy (α = .86), Environmental Mastery (α = .90), Personal Growth (α = .87), Positive Relations with Others (α = .91), Purpose in Life (α = .90), and Self-Acceptance (α = .93).
• 84-Item Version (14 items/subscale): Displays robust internal consistency ranging from α = .83 to α = .91 across diverse adult samples.
• 42-Item Version (7 items/subscale): Regularly deployed in psychological and sociological investigations, maintaining acceptable to strong internal reliability: Autonomy (α = .71 to .78), Environmental Mastery (α = .74 to .82), Personal Growth (α = .72 to .80), Positive Relations with Others (α = .75 to .83), Purpose in Life (α = .73 to .81), and Self-Acceptance (α = .79 to .85).
• 18-Item Short Form (3 items/subscale): Exhibits modest internal consistency due to subscale brevity and item heterogeneity: Autonomy (α = .37 to .52), Environmental Mastery (α = .49 to .62), Personal Growth (α = .40 to .55), Positive Relations with Others (α = .56 to .66), Purpose in Life (α = .33 to .50), and Self-Acceptance (α = .52 to .68). Despite lower Cronbach’s alpha values, structural equation modeling shows that the 18-item version maintains structural integrity, cross-temporal predictive power, and concurrent biological associations in large-sample population research.

Test-Retest Stability

Temporal stability assessments conducted across short intervals (e.g., six-week to eight-week windows) demonstrate solid stability coefficients for the parent scales: Autonomy (r = .88), Environmental Mastery (r = .81), Personal Growth (r = .81), Positive Relations with Others (r = .85), Purpose in Life (r = .82), and Self-Acceptance (r = .85). Over multi-year intervals in the MIDUS longitudinal study (spanning 9- to 10-year waves), test-retest coefficients range between .50 and .65, reflecting both trait-like stability and meaningful life-course developmental changes across adult aging trajectories.

Factor Analysis

The latent dimensionality of the PWB has generated extensive psychometric analysis, debate, and structural equation modeling (SEM) in the empirical literature.

Exploratory and Confirmatory Factor Analyses

During scale construction, item selection procedures were guided by exploratory factor analyses (EFA) and extensive construct-definition reviews. Subsequent structural validation conducted by Ryff and Keyes (1995) using a nationally representative sample of 1,108 adults rigorously tested the latent structure through confirmatory factor analysis (CFA). They systematically evaluated competing theoretical models:

• Single-Factor Model: A baseline model specifying all items loading on a unitary “global wellbeing” latent construct. This model exhibited poor fit across all conventional metrics (χ²/df ratios exceeding acceptable thresholds, RMSEA > .10, CFI < .75).
• Fully Independent Six-Factor Model: Specified six distinct, orthogonal factors corresponding to the six theoretical dimensions. This model also demonstrated suboptimal fit due to the empirical inter-correlations among the dimensions.
• Correlated Six-Factor Model: Specified six oblique latent factors matching the six proposed subscales. This model demonstrated superior fit compared to single-factor and orthogonal alternatives (χ² = 380.20, df = 120, RMSEA = .044, CFI = .94).
• Hierarchical (Second-Order) Six-Factor Model: Specified a single higher-order eudaimonic wellbeing factor governing the six first-order subscale dimensions. The fit of this second-order model was statistically equivalent to the correlated six-factor model (χ² = 389.24, df = 129, RMSEA = .043, CFI = .94), supporting the conceptualization of the construct as a multifaceted yet integrated psychological system.

The Dimensionality Controversy

The factor structure of the PWB became the subject of intense psychometric scrutiny following critiques by Springer, Hauser, and Freese (2006). Utilizing extensive datasets from the Wisconsin Longitudinal Study (WLS), the National Survey of Families and Households (NSFH), and MIDUS, these sociologists argued that several dimensions—particularly Self-Acceptance and Environmental Mastery—exhibited latent factor inter-correlations approaching unity (r > .85 to .90) after correcting for measurement error. They asserted that empirical data failed to support a six-dimensional architecture, proposing instead a reduced two-factor or single global factor structure.

In response, Ryff and colleagues (2006, 2020) demonstrated that collapsing these distinct theoretical dimensions into a single latent variable obscures vital developmental trajectories and biological signatures. For example, age-trajectory analyses consistently demonstrate that across the lifespan, Environmental Mastery systematically increases with age, while Purpose in Life and Personal Growth show pronounced age-related declines in late adulthood. Similarly, cross-cultural studies in East Asia (e.g., Japan) reveal distinct factor loading patterns and lower correlations between Autonomy and Positive Relations, underscoring cultural nuances in self-construal. Bifactor modeling and exploratory structural equation modeling (ESEM) conducted by Marsh and colleagues (2020) have supported Ryff’s model, confirming that while a general eudaimonic wellbeing factor accounts for substantial shared variance, the six specific factor dimensions retain significant unique variance predictive of diverse psychological and biomedical criteria.

Instrument / Measurement Tool

• Test Type: Multidimensional psychometric self-report psychological rating scale.
• Assessment Format: Paper-and-pencil questionnaire, computer-assisted self-interview (CASI), or web-based survey administration.
• Administration Modality: Individual or group administration; self-administered or structured interview.
• Target Population: Adults (aged 18 to 100+ years); validated adaptations exist for adolescents and university populations.
• Estimated Administration Time:
  • 18-item version: 3 to 5 minutes
  • 42-item version: 8 to 12 minutes
  • 84-item version: 15 to 20 minutes
  • 120-item version: 25 to 35 minutes
• Authentic Response Scale: 6-point Likert scale:
  • 1 = Strongly disagree
  • 2 = Disagree
  • 3 = Disagree slightly
  • 4 = Agree slightly
  • 5 = Agree
  • 6 = Strongly agree
• Structural Subscales (18-Item Short Form):
  • Autonomy: Items 1, 7, 13
  • Environmental Mastery: Items 2, 8, 14
  • Personal Growth: Items 3, 9, 15
  • Positive Relations with Others: Items 4, 10, 16
  • Purpose in Life: Items 5, 11, 17
  • Self-Acceptance: Items 6, 12, 18
• Scoring and Transformation Protocol:
  • Reverse Scoring Rules: The following items are negatively keyed and MUST be inverted prior to calculating subscale totals:
    • Reverse-scored items: 1, 2, 3, 8, 9, 11, 12, 13, 17, 18
    • Mathematical inversion formula: Score_Inverted = 7 - Original_Score (i.e., 1 → 6, 2 → 5, 3 → 4, 4 → 3, 5 → 2, 6 → 1).
  • Positively Keyed Items: Items 4, 5, 6, 7, 10, 14, 15, 16 are scored directly as endorsed.
  • Subscale Score Calculation: Sum the three item scores for each dimension (after inverting reverse-scored items). Subscale raw scores range from 3 to 18. Higher scores indicate greater psychological functioning and maturity on that dimension.
  • Composite Global Score: While Carol Ryff advocates examining individual subscale profiles to preserve multidimensional diagnostic sensitivity, researchers frequently compute an overall eudaimonic index by summing all 18 recoded items (range: 18 to 108).

Permissions & Fee and Test Year

The Psychological Well-Being Scales were formally introduced to the scientific literature in 1989 through Carol D. Ryff’s landmark paper published in the Journal of Personality and Social Psychology. Dr. Carol D. Ryff has maintained an open-science, public-domain distribution model for bona fide non-commercial academic, clinical, and scientific research. No licensing fees or royalty payments are required for academic research, university teaching, dissertation projects, or epidemiological studies.

Researchers intending to utilize the PWB scales in academic studies are granted permission by the author, provided that appropriate scholarly attribution and bibliographic citation are maintained in all resulting publications and dissertations. For commercial implementations, pharmaceutical trials, proprietary digital health platforms, corporate wellness initiatives, or applications involving direct commercial monetisation, explicit written authorization must be requested from Dr. Carol D. Ryff through the Institute on Aging at the University of Wisconsin–Madison.

References

• Abbott, R. A., Ploubidis, G. B., Huppert, F. A., Kuh, D., Wadsworth, M. E., & Croudace, T. J. (2006). Psychometric evaluation and design of the 42-item version of the Ryff’s Psychological Well-Being Scales: Evidence from the Medical Research Council National Survey of Health and Development. Health and Quality of Life Outcomes, 4, Article 76. https://doi.org/10.1186/1477-7525-4-76
• Allport, G. W. (1961). Pattern and growth in personality. Holt, Rinehart & Winston.
• Erikson, E. H. (1959). Identity and the life cycle: Selected papers. Psychological Issues, 1(1), 1–171.
• Fava, G. A. (1999). Well-being therapy: Conceptual and technical issues. Psychotherapy and Psychosomatics, 68(4), 171–179. https://doi.org/10.1159/000012329
• Frankl, V. E. (1959). Man’s search for meaning. Beacon Press.
• Marsh, H. W., Guo, J., Parker, P. D., Nagengast, B., Asparouhov, T., Muthén, B., & Dicke, T. (2020). What goes with what? Integrating bifactor and exploratory structural equation modeling to evaluate the structure of psychological well-being. Psychological Methods, 25(3), 341–368. https://doi.org/10.1037/met0000244
• Maslow, A. H. (1968). Toward a psychology of being (2nd ed.). Van Nostrand Reinhold.
• Radler, B. T. (2014). The Midlife in the United States (MIDUS) series: A national longitudinal study of health and well-being. Open Health Data, 2(1), Article e3. https://doi.org/10.5334/ohd.ai
• Rogers, C. R. (1961). On becoming a person: A therapist’s view of psychotherapy. Houghton Mifflin.
• Ryff, C. D. (1989). Happiness is everything, or is it? Explorations on the meaning of psychological well-being. Journal of Personality and Social Psychology, 57(6), 1069–1081. https://doi.org/10.1037/0022-3514.57.6.1069
• Ryff, C. D. (2014). Psychological well-being revisited: Advances in the science and practice of eudaimonia. Psychotherapy and Psychosomatics, 83(1), 10–28. https://doi.org/10.1159/000353263
• Ryff, C. D., & Keyes, C. L. M. (1995). The structure of psychological well-being revisited. Journal of Personality and Social Psychology, 69(4), 719–727. https://doi.org/10.1037/0022-3514.69.4.719
• Ryff, C. D., & Singer, B. H. (2008). Know thyself and become what you are: A eudaimonic approach to psychological well-being. Journal of Happiness Studies, 9(1), 13–39. https://doi.org/10.1007/s10902-006-9019-0
• Springer, K. W., & Hauser, R. M. (2006). An assessment of the construct validity of Ryff’s Scales of Psychological Well-Being: Method, mode, and measurement effects. Social Science Research, 35(4), 1080–1102. https://doi.org/10.1016/j.ssresearch.2005.07.004
• Springer, K. W., Hauser, R. M., & Freese, J. (2006). Bad news for the science of well-being: Problems in measurement of psychological well-being in the Wisconsin Longitudinal Study. Social Science Research, 35(4), 1120–1131. https://doi.org/10.1016/j.ssresearch.2006.01.003

Items of the Scale