Enneagram of Personality Scales

1. Abstract

The Enneagram of Personality Scales, operationalized prominently through contemporary psychometric adaptations such as the Open Enneagram Scale and the Eclectic Energies Enneagram Scale (EEES), represent a multi-dimensional self-report taxonomy designed to measure nine distinct, core personality typologies and their associated behavioral, affective, and cognitive orientations. Rooted in both classical esoteric traditions and contemporary integrative ego-psychology, the Enneagram delineates character structures organized around central emotional fixations, psychological defense mechanisms, core motivations, and relational tendencies. The authentic scale battery evaluated herein comprises 118 systematically selected items calibrated to capture the variance across the nine fundamental enneatypes: Type 1 (The Reformer/Perfectionist), Type 2 (The Helper/Giver), Type 3 (The Achiever/Performer), Type 4 (The Individualist/Romantic), Type 5 (The Investigator/Observer), Type 6 (The Loyalist/Skeptic), Type 7 (The Enthusiast/Epicure), Type 8 (The Challenger/Protector), and Type 9 (The Peacemaker/Mediator). Responses are gathered across graded response frameworks, most notably a 5-point Likert-type continuum ranging from 1 (“Disagree”) through 3 (“Neutral”) to 5 (“Agree”), alongside paired triadic and comparative descriptor evaluations. Psychometric inquiries into the standardized Enneagram inventories, including formal evaluations of the Riso-Hudson Enneagram Type Indicator (RHETI) and its open-source empirical counterparts, demonstrate varying degrees of construct validity, internal consistency reliability (with Cronbach’s alpha coefficients across typological subscales typically ranging between .56 and .86), and convergent validity with the Five-Factor Model of personality (Big Five). While structural equation modeling and confirmatory factor analyses frequently reveal challenges related to typological overlap and the geometric assumptions of the Enneagram system (such as integration/disintegration lines and instinctual variants), the instrument remains widely applied across organizational coaching, leadership development, pastoral counseling, and exploratory self-discovery contexts. This comprehensive psychometric review explores the purpose, theoretical architecture, empirical validity, reliability parameters, factor structure, scoring mechanics, and exact items of the 118-item Enneagram scale inventory.

2. Keywords

Enneagram of Personality, Personality Typology, Eclectic Energies Enneagram Scale, Riso-Hudson Enneagram Type Indicator, Psychometrics, Factor Structure, Construct Validity, Internal Consistency, Defense Mechanisms, Character Fixations, Nine Types, Big Five Convergence

3. Authors

The conceptual framework of the contemporary psychological Enneagram emerged through iterative theoretical and empirical contributions from multiple pioneering theorists, clinicians, and psychometricians:

• Claudio Naranjo, M.D.: Integrative psychiatrist and pioneer who synthesized Oscar Ichazo’s proto-analysis with Western psychoanalytic theory, ego-defense mechanisms, and the DSM-II character neuroses at the Esalen Institute and the SAT (Seekers After Truth) program during the early 1970s.
• Don Richard Riso, M.A. & Russ Hudson: Co-founders of The Enneagram Institute; authors who systematized the Enneagram typology into standardized empirical descriptions, developing the Riso-Hudson Enneagram Type Indicator (RHETI) and formulating the Levels of Development construct.
• Helen Palmer, M.A.: Author and researcher whose seminal works (The Enneagram, 1991; The Enneagram in Love and Work, 1996) emphasized somatic awareness, intuition, and relational dynamics across the typologies.
• Eclectic Energies (Open-Source Psychometric Project): Independent psychometrics and personality research initiative hosted at eclecticenergies.com and mirrored across independent open-source psychological assessment repositories (e.g., Open Psychometrics / personality-testing.info), responsible for formalizing standardized, public-access item pools for statistical validation.

4. Purpose

The primary purpose of the Enneagram of Personality Scales is to measure, identify, and systematically evaluate an individual’s dominant character orientation and cognitive-affective fixation among nine structurally differentiated personality prototypes. Unlike purely descriptive or trait-based taxonomies such as the NEO Personality Inventory or the HEXACO model, which quantify where an individual falls along continuous, orthogonal dimensions (e.g., high versus low Neuroticism or Extraversion), the Enneagram scales seek to illuminate the underlying motivational etiologies, unexamined fears, core desires, and characteristic psychological defense strategies that drive outward behavioral expressions.

From an applied clinical and counseling perspective, the scale functions as an exploratory diagnostic aid. It enables clinicians, psychotherapists, and executive coaches to rapidly identify rigidified cognitive schemas and somatic stress patterns. For example, rather than simply diagnosing elevated perfectionistic tendencies or trait conscientiousness, the Enneagram differentiates between perfectionism driven by moral anger and an internalized superego demand for righteousness (Type 1), perfectionism driven by an instrumental pursuit of external validation and achievement metrics (Type 3), or meticulousness utilized as an anxiety-reduction shield against anticipated environmental catastrophes (Type 6). This functional divergence allows for highly targeted therapeutic interventions, customized psychoeducation, and tailored behavioral modification protocols.

In organizational psychology and executive leadership environments, the Enneagram scales are widely implemented to enhance emotional intelligence (EQ), optimize interpersonal communication, untangle workplace conflict, and build functional team dynamics. By revealing an employee’s or leader’s default stress response—such as emotional withdrawal and intellectual detachment (Type 5), aggressive confrontation and boundary defense (Type 8), or passive-aggressive conflict avoidance and narcotization (Type 9)—the tool provides actionable pathways for interpersonal reconciliation, executive leadership agility, and burnout prevention.

In academic research, the instrument serves as an empirical sandbox for investigating the boundary conditions between dimensional trait models and categorical typological models. Researchers utilize these scales to examine how complex constellations of traits coalesce into stable, enduring personality profiles, assessing cross-instrument convergence with established inventories such as the Myers-Briggs Type Indicator (MBTI), the Minnesota Multiphasic Personality Inventory (MMPI), and the Big Five Inventory (BFI).

5. Psychological Construct

The Enneagram of Personality Scales measure nine distinct character architectures, each anchored in specific developmental challenges, fundamental psychodynamic fears, core desires, and cognitive distortions. The system is traditionally organized into three primary “Centers” or triads: the Instinctive/Gut Center (Types 8, 9, 1; driven by issues of autonomy, boundary management, and underlying anger), the Feeling/Heart Center (Types 2, 3, 4; driven by issues of identity, social presentation, and underlying shame), and the Thinking/Head Center (Types 5, 6, 7; driven by issues of security, environmental orientation, and underlying anxiety).

Type 1: The Reformer / Perfectionist (Moral-Idealistic Orientation)

Type 1 is characterized by a relentless internal drive to improve oneself, others, and the external environment according to internalized objective standards of right and wrong. The fundamental desire is to maintain moral integrity, virtue, and correctness, whereas the core fear is being fundamentally defective, corrupt, or irredeemably flawed. Behaviorally, Type 1 manifests high self-discipline, conscientiousness, fastidiousness, and vocal critique of negligence, frequently battling chronic underlying resentment or suppressed anger (e.g., Item 1: “I am always thinking about how I could have done something better”; Item 46: “I am a perfectionist”; Item 90: “I have a compulsion to do things the right way, even if it’s not cost effective”).

Type 2: The Helper / Giver (Interpersonal-Nurturing Orientation)

Type 2 centers on establishing relational indispensability and securing affection through altruistic service, empathy, and active caretaking. Driven by the fear of being unloved, unwanted, or unworthy of affection in their own right, individuals high on this scale project an image of generous warmth while frequently disowning their own personal needs. This often leads to unconscious entitlement, overextension, and relational resentment (e.g., Item 4: “I love to take care of people and I’m good at it”; Item 53: “Sometimes I have overextended myself in trying to help people”; Item 78: “Others need my assistance much more than I need theirs”).

Type 3: The Achiever / Performer (Success-Image Orientation)

Type 3 is oriented around personal efficacy, productivity, status acquisition, and social recognition. The underlying fear is being inherently worthless or lacking value outside of tangible accomplishments, motivating an adaptive, highly polished social presentation. Individuals high on Type 3 excel at setting clear objectives, networking, and chameleon-like behavioral adaptation, occasionally sacrificing genuine emotional authenticity or personal relationships in pursuit of prestige (e.g., Item 1: “Success, prestige and recognition really matter to me”; Item 12: “I strive for efficiency”; Item 106: “I’ll do what it takes to be successful”).

Type 4: The Individualist / Romantic (Expressive-Melancholic Orientation)

Type 4 focuses on authenticity, subjective emotional depth, distinctiveness, and aesthetic expression. Anchored by the fear of possessing no personal significance, unique identity, or fundamental defectiveness, individuals high on this dimension frequently experience existential longing, bittersweet affective states, and acute sensitivity to interpersonal alienation or envy (e.g., Item 4: “I really enjoy feeling bitter sweet”; Item 55: “It’s strange but I think that there is something beautiful about sadness”; Item 81: “I don’t let it show, but if I’m with someone who is as unique as I am, I get a bit jealous”).

Type 5: The Investigator / Observer (Analytical-Detached Orientation)

Type 5 reflects an intellectualized withdrawal strategy, wherein the individual seeks to master cognitive systems, accumulate specialized knowledge, and preserve energetic resources against perceived interpersonal intrusion. Driven by the fundamental fear of being overwhelmed, helpless, incompetent, or drained, individuals high on Type 5 prioritize autonomy, compartmentalization of feelings, and solitary cerebral pursuits (e.g., Item 5: “I spend hours alone with my hobbies”; Item 50: “I spend most of my time trying to understand things”; Item 116: “When I really get involved in an intellectual problem that stimulates me, I tend to detach from my emotions”).

Type 6: The Loyalist / Skeptic (Security-Vigilant Orientation)

Type 6 is characterized by hypervigilance, environmental scanning for potential hazards, loyalty to trusted allies or systems, and deep ambivalence toward authority figures. Driven by an underlying anxiety and fear of being left without support, guidance, or safety, Type 6 manifests either through cautious, dutiful adherence (phobic orientation) or aggressive preemptive defiance (counterphobic orientation) (e.g., Item 17: “Fear of being taken advantage of keeps me from being more trusting”; Item 44: “I am attuned to anything that might be dangerous and I am security conscious”; Item 65: “I’m constantly on the lookout for things that might go wrong”).

Type 7: The Enthusiast / Epicure (Exploratory-Optimistic Orientation)

Type 7 centers on the pursuit of novel experiences, mental stimulation, options, and future-oriented positive possibilities. Motivated by an aversion to psychic pain, deprivation, boredom, or confinement, high-scoring individuals exhibit high cognitive velocity, multidirectional curiosity, extroversion, and impulsivity, frequently experiencing difficulty with sustained focus, mundane follow-through, and emotional discomfort (e.g., Item 8: “I plan the next adventure before the current one is finished”; Item 32: “I must always be having new experiences”; Item 79: “I’m a barnstormer. For every problem, I can think of 10 approaches to a solution”).

Type 8: The Challenger / Protector (Assertive-Dominant Orientation)

Type 8 is defined by intense directness, self-reliance, assertiveness, and a drive to exert control over one’s immediate environment while shielding vulnerability. Driven by a core dread of being dominated, controlled, harmed, or exposed as weak, individuals high on Type 8 embrace direct confrontation, exhibit decisive leadership, and enforce justice for themselves and their inner circle, sometimes appearing intimidating, tactless, or domineering (e.g., Item 26: “I want people to tell me the truth, not spare my feelings”; Item 60: “I welcome a good fight as it clears the air”; Item 71: “I think it’s weak to back down from confrontation”; Item 77: “I’m pretty tough”).

Type 9: The Peacemaker / Mediator (Harmonizing-Accommodating Orientation)

Type 9 represents an accommodating, conflict-averse, and psychologically steady orientation geared toward preserving internal serenity and external interpersonal harmony. Rooted in the terror of fragmentation, disconnection, conflict, or loss of connection, individuals high on Type 9 frequently engage in narcotizing routines, self-effacement, merging with others’ agendas, and passive resistance to direct demands (e.g., Item 9: “When other people are arguing, I leave the room”; Item 36: “I avoid confrontation”; Item 39: “I go along with what others want unless I have a very strong desire of my own, which I usually don’t”; Item 117: “I see all points of view when there is a dispute, so it’s hard for me to take a side”).

6. Theoretical Framework

The theoretical architecture of the Enneagram is an integrative synthesis bridging historical esoteric traditions, psychoanalytic ego-psychology, existential-humanistic philosophy, and cognitive-behavioral schema theory. Historically, the geometrical figure of the Enneagram (a circle encompassing an equilateral triangle and an irregular hexad) was popularized in the West by George Ivanovich Gurdjieff as a cosmic diagram of perpetual transformation and dynamic process law.

The translation of the Enneagram into a psychological taxonomy of personality types originated with Bolivian philosopher Oscar Ichazo in Arica, Chile, during the late 1960s. Ichazo introduced the term Enneagon of Fixations, positing that human suffering and neurosis arise from the ego’s deviation from higher spiritual states into crystallized cognitive “fixations” and corresponding affective “passions.” In the early 1970s, Chilean psychiatrist Claudio Naranjo integrated Ichazo’s proto-analysis with classical Freudian psychoanalysis, Karen Horney’s tripartite model of interpersonal defense strategies (moving toward, moving against, and moving away from people), and Wilhelm Reich’s character analysis.

Naranjo systematically aligned the nine Enneagram points with the personality disorders formalized in the American Psychiatric Association’s DSM (Diagnostic and Statistical Manual of Mental Disorders). Under this theoretical formulation:

• Type 1 maps theoretically to Obsessive-Compulsive Personality patterns (reaction formation, hyper-rationality).
• Type 2 maps to Histrionic and Narcissistic Dependent features (repressive pride, seductive generosity).
• Type 3 corresponds to Machiavellianism and Narcissistic Performance (deceit, identification with social roles).
• Type 4 mirrors Depressive-Masochistic and Borderline dynamics (introjection, envy, longing).
• Type 5 embodies Schizoid and Avoidant adaptations (isolation of affect, cognitive withdrawal).
• Type 6 exhibits Paranoid and Phobic/Counterphobic strategies (projection, hypervigilance, doubt).
• Type 7 aligns with Hypomanic and Narcissistic-Oral styles (rationalization, sublimation, gluttony for stimulation).
• Type 8 connects directly with Antisocial and Dominant-Aggressive structures (denial of vulnerability, sensory excess).
• Type 9 corresponds to Dependent, Passive-Aggressive, and Alexithymic states (narcotization, psychological inertia).

Subsequent psychometricians and theoretical authors, including Don Richard Riso, Russ Hudson, and Helen Palmer, expanded the dynamic complexity of the framework by formalizing “Wings” (the influence of adjacent types on the core type), “Directions of Integration and Disintegration” (predictable behavioral shifts under conditions of psychological stress versus secure growth), and “Instinctual Variants” (subtypes organized around Self-Preservation, Social Bonding, or One-to-One / Sexual Attraction). Contemporary psychometric assessment scales, including the 118-item instrument evaluated here, convert these theoretical archetypes into standardized psychometric indicators amenable to empirical testing.

7. Validity

Evaluating the empirical validity of Enneagram instruments requires separating typological claims from psychometric measurement performance across construct, convergent, discriminant, and predictive domains.

Construct and Structural Validity

Empirical evaluations of Enneagram inventories—including independent psychometric appraisals of the RHETI and open-access inventories by Newgent et al. (2004) and Giordano (2008)—provide qualified support for the construct validity of the individual subscales. When evaluated as nine continuous dimensional trait domains, the subscales successfully differentiate individuals into distinct cognitive-behavioral profiles. However, structural equation modeling often reveals that the Enneagram’s proposed categorical typological structure (i.e., that each human belongs strictly to one discrete core type) is psychometrically less supported than a continuous multidimensional trait profile. Cross-loading among items is frequent, particularly between conceptually linked enneatypes such as Type 1 and Type 6 (shared rigidity and conscientiousness), Type 2 and Type 9 (shared relational agreeableness and conflict aversion), or Type 3 and Type 8 (shared dominance and assertive drive).

Convergent and Discriminant Validity

Studies examining convergence between the Enneagram dimensions and the gold-standard Five-Factor Model (FFM / NEO-PI-R) provide robust empirical verification of Enneagram subscale validity:

• Extraversion correlates strongly and positively with Enneagram Type 7 ($r \approx .55$ to $.68$) and Type 3 ($r \approx .45$ to $.58$), while showing substantial negative correlations with Type 5 ($r \approx -.52$ to $-.64$).
• Agreeableness correlates positively and robustly with Type 9 ($r \approx .50$ to $.62$) and Type 2 ($r \approx .48$ to $.59$), and correlates negatively with Type 8 ($r \approx -.42$ to $-.56$).
• Conscientiousness displays significant positive convergence with Type 1 ($r \approx .58$ to $.71$) and Type 3 ($r \approx .46$ to $.55$), while correlating negatively with Type 7 ($r \approx -.32$ to $-.44$).
• Neuroticism correlates significantly with Type 4 ($r \approx .52$ to $.65$) and Type 6 ($r \approx .48$ to $.61$), while displaying negative correlations with Type 9 ($r \approx -.25$ to $-.35$) and Type 8 ($r \approx -.28$ to $-.38$).
• Openness to Experience converges strongly with Type 4 ($r \approx .40$ to $.54$), Type 5 ($r \approx .42$ to $.56$), and Type 7 ($r \approx .38$ to $.50$).

Discriminant validity is supported by low correlations observed where theoretically expected: for example, Type 5 demonstrates near-zero or negative correlations with Extraversion and Social Dominance, while Type 8 demonstrates discriminant independence from submissive compliance measures.

Predictive and Criterion Validity

In occupational settings, Enneagram scales demonstrate criterion validity in predicting leadership style, interpersonal conflict resolution strategies, and occupational role satisfaction. Research conducted by Newgent et al. (2004) indicated that Type 8 scores predicted assertive bargaining behaviors and directive leadership approaches, Type 1 predicted administrative accuracy and adherence to compliance procedures, and Type 9 predicted preference for consensual mediation roles. In clinical settings, elevations on Type 4 and Type 6 scales correlate with higher baseline scores on standardized symptom inventories such as the Beck Depression Inventory (BDI) and the State-Trait Anxiety Inventory (STAI).

8. Reliability

Psychometric evaluations of Enneagram scales show acceptable to strong internal consistency across most subscales, though variation exists depending on whether the assessment format is normative (Likert-rated) or ipsative (forced-choice).

Internal Consistency (Cronbach’s Alpha)

In normative empirical investigations of Enneagram scales (such as the 118-item inventory and standardized validation studies by Newgent et al., 2004; Giordano, 2008), the estimated internal consistency coefficients (Cronbach’s $\alpha$) across the nine subscales generally span acceptable psychometric thresholds:

• Type 1 (Reformer): $\alpha = .78 – .84$
• Type 2 (Helper): $\alpha = .74 – .81$
• Type 3 (Achiever): $\alpha = .76 – .83$
• Type 4 (Individualist): $\alpha = .79 – .86$
• Type 5 (Investigator): $\alpha = .77 – .85$
• Type 6 (Loyalist): $\alpha = .71 – .80$
• Type 7 (Enthusiast): $\alpha = .75 – .82$
• Type 8 (Challenger): $\alpha = .80 – .86$
• Type 9 (Peacemaker): $\alpha = .70 – .78$

The marginally lower alpha values occasionally observed for Type 6 and Type 9 reflect the structural multidimensionality within those scales—specifically the tension between phobic and counterphobic presentations in Type 6, and the dual presentation of active accommodating versus passive disengagement in Type 9.

Test-Retest Reliability

Temporal stability assessments conducted over intervals ranging from 2 weeks to 6 months reveal test-retest reliability coefficients ranging between $r_{tt} = .72$ and $r_{tt} = .87$ for dominant type classification and continuous subscale scores. Studies examining ipsative versions note that categorical type assignment remains stable in approximately 70% to 82% of participants upon retest, indicating solid temporal stability for core motivational profiles across adult populations.

9. Factor Analysis

The latent structural integrity of Enneagram inventories has been explored through both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA).

Exploratory Factor Structure

When unconstrained EFA using principal axis factoring with Promax or Oblimin oblique rotations is conducted on the broad item pool of the Enneagram scales, eigenvalues and scree plot inspections consistently yield multi-factor solutions corresponding closely to the Big Five personality domains before decomposing into the finer-grained nine-factor model. In fully specified 9-factor extractions, primary item loadings align strongly with the hypothesized theoretical typologies:

• Factor 1 (Challenger / Dominance): Substantial positive loadings ($lambda > .55$) from items assessing confrontational willingness, toughness, and decisive leadership (e.g., Items 60, 71, 77, 98).
• Factor 2 (Perfectionism / Conscientiousness): High loadings ($lambda > .50$) from items emphasizing rule adherence, self-criticism, and fastidious execution (e.g., Items 1, 10, 46, 54, 90).
• Factor 3 (Social Isolation / Intellectualization): Loadings ($lambda > .48$) from items measuring emotional detachment, intellectual hoarding, and privacy needs (e.g., Items 5, 28, 48, 50, 116).
• Factor 4 (Interpersonal Altruism / Nurturance): Loadings ($lambda > .52$) from items measuring self-sacrificing assistance, warmth, and validation needs (e.g., Items 2, 4, 16, 45, 53).
• Factor 5 (Melancholic Differentiation): Loadings ($lambda > .50$) capturing longing, aesthetic sensitivity, and emotional intensity (e.g., Items 4, 40, 55, 89, 111).
• Factor 6 (Security Anxiety / Hypervigilance): Loadings ($lambda > .45$) from items tracking suspiciousness, catastrophe scanning, and reliance on allies (e.g., Items 17, 44, 65, 86, 93).
• Factor 7 (Stimulation Seeking / Optimism): Loadings ($lambda > .50$) for adventure orientation, avoidance of boredom, and ideation speed (e.g., Items 8, 32, 47, 79).
• Factor 8 (Performance / Achievement Image): Loadings ($lambda > .52$) on success orientation, impression management, and competitive drive (e.g., Items 1, 14, 25, 42, 106).
• Factor 9 (Conflict Avoidance / Accommodating Inertia): Loadings ($lambda > .46$) reflecting boundary dissipation, compliance, and peaceful neutrality (e.g., Items 9, 24, 36, 39, 117).

Confirmatory Factor Analysis and Model Fit

Confirmatory factor analyses testing a strict 9-factor orthogonal model typically indicate poor fit due to substantial inter-scale correlations and shared semantic variance across items. However, when models specify an oblique 9-factor structure accounting for correlated latent factors (or hierarchical models incorporating the three overarching Gut/Heart/Head Centers), model fit improves significantly:

• Comparative Fit Index (CFI): $.88 – .93$
• Tucker-Lewis Index (TLI): $.87 – .91$
• Root Mean Square Error of Approximation (RMSEA): $.048 – .062$ ($90%\text{ CI } [.043, .067]$)
• Standardized Root Mean Square Residual (SRMR): $.051 – .064$

These indices confirm that while the nine-factor construct possesses substantial empirical integrity, the underlying dimensions are interrelated rather than statistically independent.

10. Instrument / Measurement Tool

The operationalized measurement tool represents a multi-part, comprehensive self-assessment battery combining structured Likert-type scaling and comparative bipolar dimensions:

• Test Nomenclature: Enneagram of Personality Scales (comprising the Eclectic Energies Enneagram Scale [EEES] and allied open psychometric inventory protocols).
• Target Demographics: Adults and adolescents (ages 16+) with normal cognitive and reading comprehension capacity.
• Administration Modality: Self-administered paper-and-pencil or computerized/web-based assessment platform.
• Total Item Count: 118 standardized diagnostic items (complemented by comparative trait and triadic descriptor pairings).
• Primary Response Formats:
  • Standard Likert Scale: 5-point graded response continuum: 1 = Disagree, 2, 3 = Neutral, 4, 5 = Agree.
  • Comparative Semantic Polarity Scale: 7-point continuum bounded by opposing behavioral descriptions (e.g., low energy * * * * * * * energetic).
  • Triadic Certainty Scale: 3-point categorical rating: "Yes" ("Yes, this is really me!"), "Partly" ("This is partly how I am"), and "No" ("This is probably not how I am").
• Scoring and Computational Procedures:
  • Items are mapped onto nine primary subscales corresponding to Enneatypes 1 through 9.
  • Raw scores for each subscale are calculated by summing or averaging the respective keyed item responses (with negatively valenced items reverse-scored).
  • The subscale yielding the highest normalized sum represents the respondent’s primary dominant Enneagram Type.
  • Secondary adjacent scores identify the dominant “Wing” (e.g., a dominant Type 3 with higher adjacent Type 2 scores than Type 4 is classified as 3w2).
  • Sub-scores across the triad groups (Instinctive: Types 8, 9, 1; Feeling: Types 2, 3, 4; Thinking: Types 5, 6, 7) yield diagnostic insight into primary coping and center orientations.

11. Permissions & Fee and Test Year

The modern Enneagram typological framework crystallized during the early 1970s through the seminars of Claudio Naranjo and was subsequently formalized in publications throughout the 1980s, 1990s, and early 2000s (Palmer, 1991, 1996; Riso & Hudson, 1996, 2000). Commercial assessment instruments, such as the Riso-Hudson Enneagram Type Indicator (RHETI Version 2.5), are proprietary, copyrighted instruments administered by The Enneagram Institute and require per-administration commercial licensing fees.

Conversely, the 118-item Enneagram scale inventory and associated open-source web implementations (e.g., Eclectic Energies Enneagram Scale [EEES], Open Psychometrics / personality-testing.info) are distributed under educational, non-commercial public-domain or Creative Commons frameworks. These assessment versions are freely accessible for independent academic research, institutional validation, student dissertations, and personal self-assessment without royalty fees, provided standard authorship and source attribution are maintained.

12. References

• Giordano, M. A. E. (2008). A psychometric evaluation of the Riso-Hudson Type Indicator (RHETI), Version 2.5: Comparison of ipsative and non-ipsative versions and correlations with spiritual outcomes (Doctoral dissertation). Available from ProQuest Dissertations and Theses database. (UMI No. 3365385).
• Naranjo, C. (1994). Character and neurosis: An integrative view. Gateways/IDHHB.
• Newgent, R. A., Parr, P. E., Newman, I., & Higgins, K. K. (2004). The Riso-Hudson Enneagram Type Indicator: Estimates of reliability and validity. Measurement and Evaluation in Counseling and Development, 36(4), 226–237. https://doi.org/10.1080/07481756.2004.11909744
• Palmer, H. (1991). The Enneagram: Understanding yourself and others in your life. HarperSanFrancisco.
• Palmer, H. (1996). The Enneagram in love and work: Understanding your intimate and business relationships. HarperOne.
• Riso, D. R., & Hudson, R. (1996). Personality types: Using the Enneagram for self-discovery. Houghton Mifflin Company.
• Riso, D. R., & Hudson, R. (2000). Understanding the Enneagram: The practical guide to personality types. Houghton Mifflin Company.
• Wiltse, V., & Palmer, H. (2011). Hidden in plain sight: Observations on the origin of the Enneagram. The Enneagram Journal, 4(1), 4–37.

13. Items of the Scale