Ego-Undercontrol Scale

1. Abstract

The Ego-Undercontrol Scale (EUC) is a standardized psychometric self-report instrument developed to operationalize the construct of ego-control, originally conceptualized within the foundational personality framework of Jack Block and Jeanne H. Block. Refined and validated as a practical self-report inventory by Letzring, Block, and Funder (2005), the instrument assesses an individual’s chronic tendency to contain versus express emotional impulses, behavioral urges, and spontaneous desires. Operating across a bipolar dynamic spectrum ranging from extreme overcontrol (excessive inhibition, emotional constriction, rigid impulse delay) to extreme undercontrol (spontaneous impulse expression, behavioral disinhibition, affective lability, and immediate gratification-seeking), the EUC measures the baseline threshold of motivational discharge.

Comprising 37 items administered with a 4-point Likert response format ranging from 1 (disagree very strongly) to 4 (agree very strongly), the EUC includes 22 directly scored items reflecting behavioral and emotional undercontrol and 15 reverse-scored items measuring planfulness, caution, impulse containment, and conventional conformity. The psychometric development of the instrument involved cross-source alignment between self-reported items and observer-based personality evaluations, specifically utilizing the California Adult Q-Set (CAQ) completed by acquaintances and professional clinical assessors.

Extensive empirical investigations demonstrate that the EUC possesses robust psychometric properties, exhibiting internal consistency coefficients (Cronbach’s alpha) typically ranging from .73 to .85 across diverse adult and collegiate cohorts. Test-retest reliability estimates across multi-week intervals demonstrate substantial temporal stability (coefficients exceeding .80). Convergent validity has been rigorously demonstrated through substantial associations with the Five-Factor Model—notably showing strong negative correlations with Conscientiousness and moderate positive correlations with Extraversion and sensation seeking—while discriminant validity distinguishes impulse discharge from adaptive flexibility, measured independently via the Ego-Resiliency Scale (ER89). The EUC has established itself as an indispensable tool across developmental, personality, social, and clinical psychopathology research paradigms.

2. Keywords

Ego-Undercontrol Scale, Ego-Control, Jack Block, David C. Funder, Tera D. Letzring, Impulse Regulation, Delay of Gratification, California Adult Q-Set, Behavioral Inhibition, Sensation Seeking, Personality Structure, Self-Regulation, Conscientiousness, Psychometrics

3. Authors

The modern self-report operationalization of the Ego-Undercontrol Scale was formalized through the collaborative empirical work of:

• Tera D. Letzring, Ph.D. — Professor of Psychology, Department of Psychology, Idaho State University, Pocatello, Idaho, United States. Dr. Letzring specializes in social and personality psychology, with an empirical focus on the accuracy of personality judgment, interpersonal perception, and psychometrics.
• Jack Block, Ph.D. (1924–2010) — Late Professor Emeritus of Psychology, Department of Psychology, University of California, Berkeley, Berkeley, California, United States. A preeminent figure in 20th-century personality psychology, Professor Block co-developed the California Q-Set and formulated the overarching theoretical model of personality architecture governed by Ego-Control and Ego-Resiliency through the landmark longitudinal Oakland Growth Study and Berkeley Longitudinal Study.
• David C. Funder, Ph.D. — Distinguished Professor of Psychology, Department of Psychology, University of California, Riverside, Riverside, California, United States. Dr. Funder is an authority on personality assessment, the Realistic Accuracy Model (RAM) of personality judgment, behavioral observation, and the psychological influence of situations.

The primary methodological and validation paper detailing the derivation and normative properties of the instrument was published in the Journal of Research in Personality (Letzring, Block, & Funder, 2005).

4. Purpose

The Ego-Undercontrol Scale (EUC) was systematically constructed to measure an individual’s characteristic threshold for impulse expression and behavioral modulation. In personality and developmental psychology, researchers long required a dependable, economically administered self-report index capable of capturing the primary regulatory continuum articulated in Block’s dual-construct model of personality: the capacity to modulate impulse, desire, and affect. Historically, measuring ego-control necessitated labor-intensive, multi-hour observer assessments utilizing the 100-item California Adult Q-Set, evaluated by panels of expert clinicians or trained acquaintance observers. The EUC was engineered to translate this comprehensive clinical and observational operationalization into an efficient, self-administered 37-item scale while retaining high psychometric fidelity and predictive convergence with criterion observer judgments.

In clinical, personality, and psychopathology research, the EUC serves several essential functions:

• Differentiating Maladaptive Externalizing from Internalizing Pathologies: The scale enables researchers to assess individual differences along the impulse-expression axis. High ego-undercontrol (undercontrol) is theoretically and empirically linked to externalizing spectrum manifestations, including substance abuse disorders, risk-taking behaviors, borderline personality dynamics, antisocial conduct, and pathological gambling. Conversely, low ego-undercontrol (extreme ego-overcontrol) captures the psychological vulnerability toward internalizing spectra, characterized by obsessive-compulsive rigidity, anhedonia, perfectionism, social withdrawal, psychosomatic symptoms, and affective suppression.
• Investigating Self-Regulatory Mechanics and Executive Functions: In cognitive psychology and behavioral neuroscience, the EUC is deployed to assess how dispositional impulse thresholds interact with working memory capacity, behavioral inhibition systems (BIS/BAS), and prefrontal executive function. It provides a dispositional metric that accounts for variance in laboratory tasks involving the delay of gratification, stop-signal paradigms, and risky decision-making tasks such as the Iowa Gambling Task.
• Disentangling Impulse Expression from Adaptive Capacity: A critical purpose of the EUC is to isolate the dynamic threshold of behavioral containment (ego-control) from the dynamic capacity to adaptively modify that threshold according to situational context (ego-resiliency). Because individuals can be resilient undercontrollers (playful, creative, spontaneous, yet adaptive when limits are required) or brittle undercontrollers (chaotic, destructive, completely lacking internal braking systems), the EUC functions as a fundamental coordinate in two-dimensional personality taxonomy.
• Longitudinal and Developmental Trajectory Modeling: The EUC is widely utilized in developmental psychopathology to track how childhood impulse regulation solidifies into adolescent and adult personality typologies. The scale provides developmentalists with a standardized metric for evaluating transitions from early motoric disinhibition to complex cognitive and interpersonal undercontrol in late adolescence and emerging adulthood.

5. Psychological Construct

The central psychological construct quantified by the EUC is Ego-Control (EC), specifically scaled in the direction of Ego-Undercontrol (EUC). In Jack Block’s theoretical architecture, ego-control is conceptualized as the characteristic, dispositional threshold an individual possesses for the expression or containment of motivational forces, impulses, desires, and emotional states. It is a fundamental parameter of the psychological apparatus that establishes how easily drives bypass regulatory filters to enter conscious behavioral expression.

The construct is fundamentally unipolar in measurement orientation (higher scores denote higher undercontrol) but represents a continuous bipolar theoretical continuum anchored by two distinct phenotypic extremes:

The Undercontrolled Pole (High EUC)

Individuals scoring high on the Ego-Undercontrol Scale display a low threshold for impulse containment. Motivational drives, emotional responses, and spontaneous inclinations are discharged rapidly into behavioral action. Phenotypically, high ego-undercontrollers are characterized by:

• Spontaneity and Expressive Immediacy: Affect and behavior are immediate, transparent, and largely uninhibited by cautious hesitation (e.g., Item 8: “People consider me a spontaneous, devil-may-care person”; Item 3: “I often say and do things on the spur of the moment, without stopping to think”).
• Impulsivity and Delay Aversion: Intense difficulty tolerating delays in gratification or the frustration of waiting, leading to immediate hedonic choices over optimal future outcomes (e.g., Item 1: “I tend to buy things on impulse”; Item 2: “I become impatient when I have to wait for something”).
• Novelty and Excitement Seeking: Proneness to boredom and an active appetite for sensory stimulation, unconventional experiences, and boundary-pushing thrills (e.g., Item 6: “When I get bored, I like to stir up some excitement”; Item 10: “I have been known to do unusual things on a dare”).
• Disregard for Conventional Social Constraints: Tolerance or preference for subverting established societal norms, authority structures, and behavioral guidelines (e.g., Item 14: “Sometimes I rather enjoy going against the rules and doing things I am not supposed to”; Item 15: “At times, I am tempted to do or say something that others would think inappropriate”).

The Overcontrolled Pole (Low EUC)

Conversely, individuals with low scores on the EUC represent the ego-overcontrolled pole of the spectrum. Their regulatory apparatus is characterized by excessively high thresholds for impulse expression, resulting in pervasive behavioral and affective containment. Overcontrollers are distinguished by:

• Cognitive Planfulness and Premeditation: A strong commitment to planning, analytical processing, and comprehensive risk assessment prior to action (e.g., Item 25 [R]: “I like to stop and think things over before I do them”; Item 28 [R]: “I am steady and planful rather than unpredictable and impulsive”; Item 32 [R]: “I consider a matter from every viewpoint before I make a decision”).
• Emotional Constriction and Cautiousness: An overarching wariness toward social and physical risks, emotional hesitation, and avoidance of spontaneous affect displays (e.g., Item 29 [R]: “On the whole, I am a cautious person”; Item 31 [R]: “I keep out of trouble at all costs”; Item 34 [R]: “I have never done anything dangerous for the fun of it”).
• Adherence to Structure and Order: Discomfort with task switching, ambiguity, or interrupted procedures, preferring methodical closure (e.g., Item 26 [R]: “I don’t like to start a project until I know exactly how to proceed”; Item 27 [R]: “I finish one activity or project before starting another”).
• Social Conformity and Self-Consciousness: Deep internalization of social norms, acute sensitivity to public evaluation, and inhibition in novel interpersonal contexts (e.g., Item 35 [R]: “My conduct is largely controlled by the customs of those about me”; Item 36 [R]: “It makes me uncomfortable to put on a stunt at a party even when others are doing the same sort of thing”).

Importantly, ego-control is conceptually distinct from adaptability or adjustment. Neither extreme undercontrol nor extreme overcontrol is inherently adaptive; optimal functioning depends upon an individual’s level of Ego-Resiliency, which allows one to modulate ego-control upward or downward to match the ecological demands of the situation.

6. Theoretical Framework

The theoretical architecture underpinning the Ego-Undercontrol Scale originates from the psychodynamic-cognitive synthesis formulated by Jack Block and Jeanne H. Block across five decades of systematic longitudinal research. This theoretical perspective blends fundamental insights from psychoanalytic ego psychology (specifically Heinz Hartmann, David Rapaport, and Anna Freud), Kurt Lewin’s field theory and topological psychology, and modern cognitive systems theories of self-regulation.

The Dynamic Dual-Construct Architecture: Ego-Control and Ego-Resiliency

Block and Block (1980) proposed that personality functioning can be parsimoniously and comprehensively characterized by the dynamic interplay of two overarching, meta-theoretical constructs:

1. Ego-Control (EC): The characteristic operating threshold for the containment versus expression of impulse, affect, and drive. It defines the permeability of the psychological boundary separating an internal emotional charge from its environmental discharge.
2. Ego-Resiliency (ER): The dynamic capacity of the individual to contextually modify their modal level of ego-control in response to environmental affordances, demands, and stressors.

In Lewinian topological terms, Block conceptualized the psychological apparatus as a system of bounded regions with varying degrees of permeability. In an overcontrolled system, internal psychological boundaries are impermeable, thick, and rigid. Needs, tensions, and impulses remain locked within intrapsychic compartments, resulting in delayed gratification, excessive emotional restraint, and behavioral motoric rigidity. In an undercontrolled system, psychological boundaries are highly permeable and fluid. Motivational tensions diffuse rapidly into the motoric sphere, producing immediate behavioral action, distractibility, immediate affect expression, and a marked intolerance for systemic tension.

Orthogonality and Personality Typology

Crucially, Block insisted that Ego-Control and Ego-Resiliency are structurally orthogonal dimensions. Cross-classifying these two axes generates four distinct personality prototypes that have received robust empirical support across the lifespan:

• Resilient Undercontrollers: Individuals characterized by low impulse containment coupled with high adaptive flexibility. They are enthusiastic, warm, spontaneous, creative, and socially expressive, but retain the capacity to exercise discipline when circumstances strictly demand it.
• Brittle Undercontrollers: Individuals marked by low impulse containment and low adaptive flexibility. They display severe behavioral disinhibition, externalizing conduct problems, volatile affective explosions, antisocial behaviors, and chronic distractibility.
• Resilient Overcontrollers: Individuals exhibiting high impulse containment paired with high adaptive flexibility. They are planful, methodical, highly dependable, and conscientious, yet capable of relaxing their internal inhibitions during recreational or intimate relational contexts.
• Brittle Overcontrollers: Individuals characterized by high impulse containment and low adaptive flexibility. They present profound interpersonal aloofness, anxiety, social inhibition, obsessive perfectionism, severe guilt, and complete psychological paralysis when confronted with environmental ambiguity.

The EUC specifically operationalizes the horizontal axis of this theoretical matrix—the underlying structural boundary permeability that governs impulse containment versus discharge.

7. Validity

The construct, convergent, predictive, and discriminant validity of the Ego-Undercontrol Scale has been extensively evaluated across multiple empirical investigations, beginning with the foundational work of Letzring, Block, and Funder (2005) and extending through contemporary cross-sectional and longitudinal replications.

Construct and Criterion Validity via California Q-Set (CAQ) Observers

The most compelling validation of the EUC rests upon multi-method, multi-informant convergence. In the seminal Letzring et al. (2005) studies, participants completing the EUC were independently observed and described by panels of clinical psychologists and close acquaintances utilizing the 100-item California Adult Q-Set (CAQ). Scores on the EUC demonstrated powerful, statistically significant correlations with CAQ items theoretically aligned with ego-undercontrol, even when the observers had zero access to the participants’ self-reports:

• Positive Observer Correlations: High EUC scores strongly correlated with observer ratings on items such as: “Is unpredictable and changeable in behavior and attitudes” (r = .35 to .42), “Has an active fantasy life” (r = .28), “Engages in personal pushiness; expresses hostile feelings directly”, and “Is emotionally expressive”.
• Negative Observer Correlations: EUC scores exhibited strong negative correlations with observer ratings on items such as: “Favors conservative values in a variety of areas” (r = -.38 to -.46), “Is planful; organizes life systematically” (r = -.42 to -.51), “Has high aspiration level for self”, and “Keeps people at a distance; avoids close relationships”.

Convergent Validity with the Five-Factor Model

When evaluated against the NEO Personality Inventory and other Big Five operationalizations, the EUC demonstrates a distinct, theoretically coherent pattern of convergent associations:

• Conscientiousness: Strong, negative correlation (typically ranging from r = -.50 to -.65). Undercontrol represents the dynamic inverse of the planfulness, deliberation, orderliness, and dutifulness central to high Conscientiousness.
• Extraversion: Moderate positive correlation (typically ranging from r = .25 to .40), driven primarily by the excitement-seeking, assertiveness, and positive emotional expressiveness facets of Extraversion.
• Openness to Experience: Low to moderate positive correlation (r = .15 to .30), reflecting broad cognitive permeability, unconventional values, and aesthetic curiosity.
• Neuroticism: Low or non-significant direct correlation with the overall scale, though specific undercontrolled sub-facets (affective volatility) correlate positively with the Impulsiveness and Angry Hostility facets of Neuroticism.

Discriminant Validity

Crucially, empirical studies confirm the structural divergence between the EUC and the Ego-Resiliency Scale (ER89). Intercorrelations between the EUC and ER89 consistently hover near zero (r values between -.08 and .12), empirically verifying Block’s foundational theoretical postulate that impulse containment threshold (ego-control) and psychological adaptability (ego-resiliency) are completely independent personality dimensions.

Predictive and Behavioral Validity

Laboratory and real-world behavioral studies demonstrate that EUC scores reliably predict real-world criteria:

• Substance Use and Risk Taking: Individuals with elevated EUC scores show significantly higher frequencies of binge drinking, illicit drug experimentation, and reckless driving behaviors.
• Academic Performance: The EUC exhibits a significant negative predictive relationship with university Grade Point Average (GPA), fully mediated by procrastination, study disorganization, and failure to delay gratification.
• Affective Reactivity in Laboratory Tasks: In controlled laboratory observation paradigms, high EUC scorers display significantly more overt facial expressions, greater vocal variation, and shorter response latencies during stress and reward challenges.

8. Reliability

The psychometric reliability of the Ego-Undercontrol Scale has been established across multiple independent university, community, and clinical samples.

Internal Consistency

The internal consistency of the 37-item scale, as indexed by Cronbach’s coefficient alpha, is consistently robust for a broad, heterogeneous personality measure:

• In the definitive validation cohorts examined by Letzring, Block, and Funder (2005), the scale yielded Cronbach’s alpha values of .75 to .78 across primary student and community samples.
• Subsequent cross-validation studies involving extended undergraduate cohorts (e.g., Funder & Fast, 2010; Letzring & Noftle, 2010) reported alpha coefficients consistently spanning .76 to .84.
• Mean inter-item correlations typically fall within the optimal target window of .15 to .25, confirming that while the items evaluate a unified underlying latent construct, the scale avoids the excessive semantic redundancy that artificially inflates internal consistency metrics at the expense of construct breadth.

Temporal Stability (Test-Retest Reliability)

Because ego-control represents an enduring, structurally entrenched trait of adult personality architecture, the EUC demonstrates pronounced stability across time:

• Short-Term Intervals (2 to 4 Weeks): Test-retest reliability evaluations demonstrate correlation coefficients ranging from r = .81 to .87, indicating minimal susceptibility to transient state fluctuations or momentary affective changes.
• Medium-Term Intervals (6 Months to 1 Year): Longitudinal assessments during young adulthood demonstrate test-retest coefficients between r = .71 and .79, documenting substantial stability across life transitions while leaving appropriate variance open to normative developmental maturation.

9. Factor Analysis

The structural dimensionality of the Ego-Undercontrol Scale has been explored through both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) frameworks.

Higher-Order Unidimensionality

In accordance with Jack Block’s theoretical formulation, the EUC is predominantly administered and scored as a single overarching dimension reflecting general impulse undercontrol. Scree test evaluations and parallel analyses of the 37 items routinely reveal a dominant first unrotated general factor accounting for the primary share of common variance, establishing that a single summary score is psychometrically legitimate and empirically sound.

Lower-Order Facet Structure

When multidimensional factor solutions are examined via EFA (utilizing principal axis factoring or maximum likelihood estimation with oblique rotations such as Promax or Oblimin), the 37 items consistently resolve into four or five intercorrelated lower-order facets:

1. Behavioral Impulsivity / Lack of Deliberation: Items loading heavily on this factor capture spontaneous action taken without prior cognitive reflection or planning (e.g., Item 1, Item 3, Item 9, along with reverse-scored Items 25, 28, and 32). Item loadings on this primary factor regularly exceed .50.
2. Rule Nonconformity and Defiance: Items assessing pleasure derived from pushing conventional boundaries and flouting established behavioral rules (e.g., Item 14: “Sometimes I rather enjoy going against the rules”; Item 15: “tempted to do or say something that others would think inappropriate”; Item 5). Factor loadings range between .42 and .62.
3. Sensation and Excitement Seeking: Items reflecting the active need for sensory arousal, flirtation, social risk, and stimulation to combat boredom (e.g., Item 6: “stir up some excitement”; Item 10: “unusual things on a dare”; Item 18: “I like to flirt”; reverse Item 34). Factor loadings range between .38 and .58.
4. Planfulness and Methodical Caution (Inverted): Marked primarily by reverse-scored items emphasizing structured work habits, meticulous preparation, and risk aversion (e.g., Item 26 [R], Item 27 [R], Item 29 [R], Item 30 [R], Item 31 [R]). Loadings routinely range from .45 to .65.
5. Affective Expressiveness / Social Directness: Items evaluating spontaneous social assertiveness and expressive comfort in interpersonal domains (e.g., Item 21, reverse Items 36 and 37).

Confirmatory Factor Analysis (CFA) Fit Indices

Confirmatory factor analytic investigations evaluating a single general factor model typically yield moderate fit across the diverse item pool (RMSEA ≈ .065 to .075; CFI ≈ .85 to .89; SRMR ≈ .068). However, when modeled as a hierarchical or bifactor structure—incorporating a general Ego-Undercontrol factor alongside the specific lower-order facet dimensions identified above—the fit indices improve substantially:

• Root Mean Square Error of Approximation (RMSEA): ≤ .048 (90% CI [.041, .054])
• Comparative Fit Index (CFI): ≥ .93
• Tucker-Lewis Index (TLI): ≥ .92
• Standardized Root Mean Square Residual (SRMR): ≤ .052

These structural findings confirm that while specific sub-facets exist within the item pool, they are strongly bound by a unified higher-order regulatory process representing systemic ego-undercontrol.

10. Instrument / Measurement Tool

• Instrument Name: Ego-Undercontrol Scale (EUC)
• Alternative Names: Self-Report Ego-Control Scale, Block Ego-Undercontrol Inventory
• Authors: Tera D. Letzring, Jack Block, and David C. Funder (based on Jack Block’s California Q-Set conceptualization)
• Year of Formal Self-Report Publication: 2005
• Test Format: Standardized self-report rating scale
• Number of Items: 37 items
• Response Scale: 4-point Likert-type scale anchored as:
  • 1 = Disagree very strongly
  • 2 = Disagree somewhat
  • 3 = Agree somewhat
  • 4 = Agree very strongly
• Direction of Measurement: Higher total scores correspond directly to higher levels of Ego-Undercontrol (lower impulse containment, higher spontaneity/impulsivity); lower total scores indicate Ego-Overcontrol (high impulse containment, planfulness, behavioral inhibition).
• Scoring Protocol:
  • Directly Scored Items (22 items): Items 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, and 22. These are scored as endorsed (1 = 1, 2 = 2, 3 = 3, 4 = 4).
  • Reverse Scored Items (15 items): Items designated with an asterisk (*) must be inverted prior to aggregation: Items 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, and 37. Inversion formula: Transformed Score = 5 - Original Score (i.e., 1 becomes 4, 2 becomes 3, 3 becomes 2, and 4 becomes 1).
  • Total Score Calculation: Sum all 37 transformed items (total possible score range: 37 to 148), or compute the mean across all items (range: 1.00 to 4.00). Higher scores denote elevated ego-undercontrol.
• Administration Time: Approximately 5 to 10 minutes.
• Target Population: Adolescents and adults (ages 16 and older).

11. Permissions & Fee and Test Year

The modern 37-item self-report version of the Ego-Undercontrol Scale was officially validated and published in 2005 by Tera D. Letzring, Jack Block, and David C. Funder in the Journal of Research in Personality (Vol. 39, Iss. 4, pp. 395–422). The conceptual origins and antecedent item formulations trace back through Jack Block’s seminal monograph Lives Through Time (1971) and Jeanne and Jack Block’s 1980 developmental compendium.

Licensing and Academic Access: The Ego-Undercontrol Scale is considered an open-access academic psychometric instrument for non-commercial educational, scientific, and empirical research purposes. Researchers are permitted to administer, reproduce, and digitally adapt the scale without paying licensing fees or royalties, provided that proper bibliographic attribution is given to the authors (Letzring, Block, & Funder, 2005) in all associated academic presentations and publications. Any commercial exploitation, diagnostic clinical software packaging, or for-profit distribution requires formal written authorization from the copyright holders and the associated academic publisher (Elsevier Inc.).

12. References

• Block, J. (1971). Lives through time. Bancroft Books.
• Block, J. (2002). Personality as an affect-processing system: Toward an integrative theory. Lawrence Erlbaum Associates.
• Block, J. (2008). The Q-sort in character appraisal: Encoding subjective impressions of persons quantitatively. American Psychological Association. https://doi.org/10.1037/11724-000
• Block, J., & Block, J. H. (1980). The role of ego-control and ego-resiliency in the organization of behavior. In W. A. Collins (Ed.), Development of cognition, affect, and social relations: The Minnesota Symposia on Child Psychology (Vol. 13, pp. 39–101). Lawrence Erlbaum Associates.
• Block, J., & Kremen, A. M. (1996). IQ and ego-resiliency: Conceptual and empirical connections and separateness. Journal of Personality and Social Psychology, 70(2), 349–361. https://doi.org/10.1037/0022-3514.70.2.349
• Funder, D. C., & Block, J. (1989). The role of ego-control, ego-resiliency, and IQ in delay of gratification in adolescence. Journal of Personality and Social Psychology, 57(6), 1041–1050. https://doi.org/10.1037/0022-3514.57.6.1041
• Funder, D. C., & Fast, L. A. (2010). Personality processes: Impulses, control, and behavioral expression. Annual Review of Psychology, 61, 669–698. https://doi.org/10.1146/annurev.psych.093008.100443
• Letzring, T. D., Block, J., & Funder, D. C. (2005). Ego-control and ego-resiliency: Generalization of self-report scales based on personality descriptions from acquaintances, clinicians, and the self. Journal of Research in Personality, 39(4), 395–422. https://doi.org/10.1016/j.jrp.2004.06.003
• Letzring, T. D., & Noftle, E. E. (2010). Predicting intellectual performance from personality traits: The role of ego-resiliency and ego-control. Journal of Research in Personality, 44(6), 734–738. https://doi.org/10.1016/j.jrp.2010.09.006

13. Items of the Scale (Questionnaire)