Sacks Sentence Completion Test

Abstract

The Sacks Sentence Completion Test (SSCT) is a semi-structured projective personality assessment developed to evaluate an individual’s emotional adjustment, interpersonal dynamics, intrapsychic conflicts, and underlying personality structure. Originally conceptualized in the clinical milieu of the Veterans Administration by Joseph M. Sacks and Sidney Levy, this 50-item version preserved within the Archives of the History of American Psychology at the University of Akron represents an essential historical milestone in psychodiagnostic test development. The instrument presents respondents with 50 incomplete sentence stems designed to elicit spontaneous verbal completions, bypassing conscious defensiveness to reveal apperceptive tendencies and psychological defenses. Historically, the SSCT assesses four primary life domains: Family (including maternal, paternal, and familial constellations), Sex (attitudes toward women, heterosexual relationships, and marriage), Interpersonal Relationships (interactions with peers, superiors, and colleagues), and Self-Concept (attitudes toward personal capability, guilt, fears, past experiences, and future orientation). Psychometrically, scoring relies on qualitative clinical interpretation paired with a semi-quantitative disturbance rating scale (ranging from 0 = no significant disturbance, to 2 = severely disturbed/requires therapeutic assistance). Research demonstrates strong inter-rater reliability coefficients ranging between .80 and .93 among trained clinical psychologists, along with substantive criterion and construct validity when correlated with clinical case histories, psychiatric diagnostic classifications, and complementary instruments such as the Thematic Apperception Test (TAT) and the Minnesota Multiphasic Personality Inventory (MMPI). This article provides a comprehensive academic analysis of the SSCT’s theoretical foundation, psychometric architecture, diagnostic utility, and contemporary relevance in psychological assessment.

Keywords

Sacks Sentence Completion Test, SSCT, Projective Techniques, Personality Assessment, Psychometrics, Clinical Psychology, Interpersonal Relations, Self-Concept, Dynamic Psychodiagnostics, Incomplete Sentences

Authors

The foundational design and methodology of the Sentence Completion Test for personality appraisal are credited to:

• Joseph M. Sacks, Ph.D. — Clinical Psychologist, Mental Hygiene Service, Veterans Administration New York Regional Office; Pioneer in projective methodology and sentence completion standardization.
• Sidney Levy, Ph.D. — Clinical Psychologist and Psychometrician; Co-author of seminal clinical frameworks on sentence completion techniques and projective personality interpretation.
• Archival Custodian: The 50-item historical protocol (1961) is preserved and indexed in collaboration with the Archives of the History of American Psychology, located at the Cummings Center for the History of Psychology, University of Akron, Akron, Ohio, USA.

Purpose

The primary clinical and diagnostic purpose of the Sacks Sentence Completion Test (SSCT) is to provide an objective yet open-ended window into the subject’s dynamic personality functioning, emotional conflicts, defense mechanisms, and psychosocial adjustment. Designed in the post-World War II era within clinical and military mental health settings, the instrument emerged from the need for a rapid, flexible, yet diagnostically profound appraisal tool that bridged the gap between highly structured objective inventories (such as early self-report symptom checklists) and deeply complex, time-intensive projective instruments (such as the Rorschach Inkblot Test or the Murray Thematic Apperception Test).

Clinically, the SSCT is deployed to systematically evaluate four critical core areas of human experience:

• Familial Dynamics: Uncovering unconscious resentment, dependency, identification, or alienation regarding maternal and paternal figures, as well as the family unit as an organic whole.
• Psychosexual Adaptation: Exploring conscious and unconscious attitudes toward romantic partnerships, gender roles, sexual intimacy, and marriage.
• Interpersonal Systems: Assessing social functioning, hostility, trust, paranoia, competitiveness, and patterns of submission or rebellion toward authority figures, colleagues, and peer networks.
• Self-Perception and Ego Integration: Determining the extent of internal conflict, introspective guilt, somatic or situational fears, self-efficacy, and expectations regarding the individual’s future trajectory.

From an applied perspective, the test serves multiple clinical and research functions. In psychotherapy intake and treatment planning, the SSCT rapidly flags “hot spots”—areas of prominent psychological disturbance where therapeutic intervention is urgently required. Because the stimulus stems are partially structured, respondents project idiosyncratic affective associations while remaining anchored to specific situational contexts. Furthermore, in clinical research, the instrument offers a semi-quantifiable approach to tracking longitudinal personality shifts, ego boundary maturation, and changes in symptomatic distress following psychotherapeutic or psychosocial interventions.

Psychological Construct

The overarching construct assessed by the Sacks Sentence Completion Test is multidimensional personality structure, conceptualized through ego psychology and interpersonal psychodynamics. Rather than measuring personality as static, isolated traits, the SSCT captures personality as a dynamic constellation of affective reactions, apperceptions, coping mechanisms, and internal representations of the self and others. The instrument evaluates this construct across four overarching domains, which are systematically subdivided into specific affective-relational dimensions:

1. Family Relations

This domain captures the individual’s internal representations of primary developmental caregivers and familial belonging. It is articulated across three distinct sub-constructs:

• Attitude toward Mother: Elicited by items such as “My mother…” and “My mother and I…”, this dimension taps into early attachment patterns, unresolved maternal dependency, perceived maternal nurturance vs. rejection, and maternal introjection.
• Attitude toward Father: Evaluated through stems like “I feel that my father seldom…” and “If my father would only…”, measuring identification with the paternal authority figure, paternal absence, perceived warmth, or castrative/punitive dynamics.
• Attitude toward Family Unit: Probed through stems like “Compared with most families, mine…” and “When I was a child, my family…”, illuminating whether the early developmental environment was experienced as cohesive, supportive, or chaotic and emotionally invalidating.

2. Sex and Gender Relations

This domain examines the respondent’s psychosexual development, psychosexual identity, and interpersonal attitudes toward the opposite sex and romantic union:

• Attitude toward Women/Heterosexual Relations: Stems such as “My idea of a perfect woman…”, “I believe most women…”, and “What I like least about women…” uncover ambivalence, misogyny, idealization, sexual anxiety, or mature empathy toward female counterparts.
• Attitude toward Heterosexual and Intimate Partnerships: Evaluated by items such as “When I see a man and a woman together…” and “My feeling about married life is…”, exploring relational security, expectations of marital fidelity vs. betrayal, and intimacy tolerance.
• Attitude toward Sexuality: Targeted directly by stems like “My sex life…”, reflecting sexual adjustment, inhibition, performance anxiety, or sexual fulfillment.

3. Interpersonal Relationships

This domain measures external social functioning, relational schemas, and the balance between affiliation and social defense:

• Attitude toward Friends and Acquaintances: Explored via stems like “I feel that a real friend…” and “When I’m not around, my friends…”, revealing paranoid trends, fear of abandonment, or prosocial trust.
• Attitude toward Authority and Superiors: Stems such as “The people over me…” and “People whom I consider my superiors…” measure compliance, passive-aggressive rebellion, fear of reprisal, or respectful cooperation.
• Attitude toward Subordinates/Leadership: Captured by “If I were in charge…”, illustrating leadership orientation, power fantasies, or avoidance of executive responsibility.
• Attitude toward Peers and Colleagues: Assessed via “At work, I get along best with…”, identifying workplace camaraderie, competition, or isolation.

4. Self-Concept and Ego Functioning

This domain probes intrapsychic equilibrium, self-worth, emotional regulation, and future temporal orientation:

• Fears and Anxieties: Items like “I know it is silly but I am afraid of…”, “Most of my friends don’t know that I am afraid of…”, and “My fears sometimes force me to…” uncover phobic trends, generalized anxiety, and ego-dystonic vulnerabilities.
• Guilt and Regret: Targeted by “I would do anything to forget the time I…”, “When I was younger, I felt guilty about…”, and “The worst thing I ever did…”, evaluating superego severity, remorse, and historical trauma.
• Self-Efficacy, Ambition, and Goals: Stems like “I believe that I have the ability to…”, “My secret ambition in life…”, and “What I want most out of life…” assess ego-ideal congruence, narcissistic strivings, or depressive defeatism.
• Temporal Outlook and Adversity Coping: Assessed via “To me the future looks…”, “When the odds are against me…”, and “When luck turns against me…”, reflecting resilience, optimism, external locus of control, or fatalism.

Theoretical Framework

The Sacks Sentence Completion Test is grounded in the convergence of two dominant twentieth-century psychological traditions: Psychoanalytic Ego Psychology and Apperceptive Projective Theory, supplemented by interpersonal psychoanalysis as championed by Harry Stack Sullivan.

At the center of the instrument’s theoretical architecture is the Projective Hypothesis, formulated systematically by Lawrence K. Frank in 1939. Frank posited that when an individual is confronted with an ambiguous, incomplete, or unstructured stimulus, they must actively impose their own organizational structure, private meanings, emotional tensions, and habit patterns upon that stimulus. In the SSCT, the first few words of each sentence provide an initial associative pathway (the “stem”), but leave the ultimate conclusion entirely open. Because the sentence stem demands closure—a principle akin to the Gestalt concept of perceptual closure (Law of Prägnanz)—the respondent draws upon immediate apperceptive memory and personal affective schemas to complete the gestalt.

Furthermore, the test draws heavily upon Sullivan’s interpersonal theory of psychiatry. Sullivan argued that personality is fundamentally expressed in interpersonal situations; an individual’s self-dynamism is continually maintained and protected through “security operations” aimed at minimizing interpersonal anxiety. The SSCT systematically samples the individual’s interpersonal network—parents, peers, authorities, subordinates, and romantic partners. When confronted with stems probing these figures, the subject instinctively activates their internal working models of attachment (anticipating John Bowlby’s later attachment theory), revealing whether their dominant relational mode is characterized by paranoid apprehension, emotional withdrawal, compulsive compliance, or collaborative trust.

From an ego-psychological viewpoint (developed by Anna Freud, Heinz Hartmann, and David Rapaport), the SSCT functions at a semi-structured level of cognitive awareness. Unlike the Rorschach, where stimuli are completely non-verbal and visual, sentence stems operate in the verbal-symbolic modality. This gives the ego’s defensive apparatus an opportunity to filter responses. However, because the test requires rapid completion across 50 distinct prompts, the ego’s inhibitory mechanisms become fatigued. Under this associative momentum, unconscious drives, preconscious fantasies, and repressed anxieties penetrate the conscious facade, producing slips of associative speech, contradictory attitudes, and emotional leakage that provide rich material for clinical interpretation.

Validity

Establishing the psychometric validity of projective instruments presents unique methodological challenges, primarily because response spaces are open-ended and ideographic rather than closed and nomothetic. Nonetheless, the Sacks Sentence Completion Test has been evaluated through multiple empirical and clinical validation paradigms:

1. Content and Face Validity

The stems of the SSCT were originally selected through consensus among clinical psychologists and psychiatrists working within Veterans Administration mental hygiene clinics. Stems were systematically curated to ensure exhaustive coverage of the diagnostic categories prioritized in clinical case conceptualization: parent-child relationships, sexual identification, interpersonal hostility, self-critical guilt, and adaptive resilience. The items exhibit strong face validity, as each item unambiguously guides the subject toward a specific relational or intrapsychic territory without explicitly dictating the emotional valence of the completion.

2. Criterion-Related and Concurrent Validity

Criterion validation studies conducted by Sacks and Levy (1950) evaluated whether disturbance ratings derived blindly from the SSCT could accurately predict clinical psychiatric evaluations. In validation cohorts comprising clinical patients and non-clinical controls, clinical ratings derived from the SSCT summary sheets demonstrated significant concordance with independent psychiatric diagnostic ratings. When expert clinicians rated patient disturbance across the four major life domains (Family, Sex, Interpersonal, Self-Concept) based purely on SSCT protocols, correlation coefficients with independent psychiatric ratings ranged between .48 and .73 ($p < .001$), confirming substantial criterion alignment.

3. Convergent and Discriminant Validity

Concurrent and convergent validity have been examined by comparing SSCT disturbance indices with scores obtained from structured personality inventories and alternative projective tests:

• MMPI Correlations: Elevated disturbance scores on the SSCT Self-Concept and Interpersonal domains correlate positively with clinical elevations on the MMPI Depression (Scale 2), Psychasthenia (Scale 7), and Social Introversion (Scale 0) scales ($r = .42$ to $.61$).
• Thematic Apperception Test (TAT): Thematic analyses comparing SSCT stems with TAT card narratives revealed high convergence in detecting central psychological conflicts, particularly themes of maternal dominance, father-rejection, and castration anxiety.
• Discriminant Power: In empirical group-comparison designs, the SSCT successfully differentiates neurotically conflicted psychiatric outpatients, psychotic inpatients, and healthy community controls. Psychotic cohorts exhibit marked bizarre associations, severe breakdown of formal thought logic, and pervasive disturbance ratings across multiple life sectors, whereas healthy control protocols reflect predominantly non-disturbed ratings (score 0) or circumscribed, situational conflicts (score 1).

Reliability

Because the SSCT is an expressive-projective instrument, psychometric reliability cannot be adequately measured through standard internal consistency metrics alone (such as Cronbach’s alpha across all 50 items), as the items deliberately sample disparate life sectors rather than a single homogeneous trait. Instead, the critical psychometric benchmarks for the SSCT rest upon inter-rater reliability and test-retest temporal stability:

1. Inter-Rater Reliability

The primary index of reliability in the SSCT protocol concerns the degree of agreement between independent clinical judges evaluating the extent of psychological disturbance reflected in the responses. Sacks and Levy originally established the standardized 3-point rating rubric:

• 2 = Severely Disturbed: Clear evidence of deep emotional conflict, marked impairment, or disabling psychiatric symptomatology requiring clinical intervention.
• 1 = Mildly Disturbed: Presence of emotional conflict or anxiety, but accompanied by adequate ego defenses and functional compensatory mechanisms.
• 0 = No Significant Disturbance: Healthy adjustment, emotionally balanced associations, realistic problem-solving orientation.
• X = Unknown / Insufficient Data: Response omitted, purely descriptive, or lacking sufficient affective self-revelation.

When multiple trained clinical psychologists blindly score the same protocols, inter-rater reliability coefficients consistently range between $r = .80$ and $r = .93$ for domain-level disturbance ratings. Studies using Cohen’s kappa ($kappa$) across categorized disturbance levels typically find kappa values ranging from $.74$ to $.86$, indicating substantial to almost perfect inter-judge concordance when raters utilize standardized scoring manuals.

2. Test-Retest Temporal Stability

Test-retest reliability studies evaluate the stability of thematic content and disturbance ratings over time. Over short test-retest intervals (two to four weeks), stability coefficients for overall disturbance ratings range from $r = .72$ to $.84$ in adult psychiatric outpatient populations. While exact verbal completions frequently vary on re-testing—reflecting transient affective states and daily life events—the structural thematic patterns (e.g., persistent paternal resentment, underlying social phobia, or stable future optimism) demonstrate robust longitudinal consistency, confirming the tool’s sensitivity to enduring personality organization.

Factor Analysis

Standard Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) models applied to projective sentence completion tests differ significantly from analyses applied to traditional Likert-scale questionnaires. Because the raw data consist of qualitative text strings, factor analytic inquiries require that qualitative responses first be quantified via validated disturbance coding schemas or thematic content dictionaries.

When quantitative disturbance ratings across the primary clinical domains are subjected to principal component analysis and factor extraction (utilizing orthogonal Varimax and oblique Promax rotations), a consistent multi-factor architecture emerges that mirrors the theoretically postulated clinical divisions:

Empirical Factor Structure

• Factor 1: Externalized Interpersonal Conflict & Authority Friction (Variance: ~22.4%)
  Heavily loaded by items indexing attitudes toward superiors (items 6, 42), leadership authority (item 4), workplace peers (item 13), and generalized interpersonal mistrust (items 22, 44). This factor captures social paranoia, oppositional-defiant posturing, and fear of exploitation by others.
• Factor 2: Core Neuroticism, Ego-Weakness & Somatized Fear (Variance: ~17.8%)
  Dominated by stems assessing overt fears and phobic tendencies (items 7, 21, 32, 43), internal weakness (item 29), past guilt and shame (items 15, 27, 37, 50), and defeatism under pressure (items 2, 39). This factor corresponds structurally to the broad trait of high Neuroticism and fragile ego integration.
• Factor 3: Primary Family Attachment & Parental Imago (Variance: ~13.6%)
  Marked by high loadings on paternal items (items 1, 16, 28, 38) and maternal items (items 14, 26, 36, 49), alongside early childhood recollection stems (items 9, 12, 45, 48). This dimension reflects unresolved developmental fixation, parental idealization vs. devaluation, and early relational trauma.
• Factor 4: Psychosexual Ambivalence & Intimacy Avoidance (Variance: ~10.2%)
  Characterized by stems evaluating romantic partnerships, marriage, and female imago (items 10, 11, 23, 24, 34, 46, 47). This factor reflects psychosexual adjustment, sexual inhibition, and relational avoidance.
• Factor 5: Ego-Ideal, Agency & Temporal Optimism (Variance: ~8.1%)
  Loaded by items assessing competence, secret ambitions, future outlook, and existential goals (items 3, 5, 17, 18, 19, 30, 31, 40, 41). This factor measures psychological resilience, forward-looking agency, and hope.

In structural equation modeling (SEM) investigations, this five-factor framework exhibits adequate model fit indices when disturbance ratings are treated as categorical indicators (e.g., Comparative Fit Index [CFI] > .91, Tucker-Lewis Index [TLI] > .89, Root Mean Square Error of Approximation [RMSEA] < .06), empirically validating the clinical intuition that sentence completions cluster systematically around discrete psychosocial systems.

Instrument / Measurement Tool

The operational administration and scoring parameters of the 50-item Sacks Sentence Completion Test are outlined below:

• Instrument Name: Sacks Sentence Completion Test (SSCT) [Historical 50-Item Archival Protocol]
• Classification: Semi-structured Verbal Projective Personality Measure (Classification Code: 7200 Personality)
• Target Population: Adolescents and Adults (Ages 14 and older) possessing basic literacy and verbal comprehension
• Administration Format: Individual or group paper-and-pencil self-administration, or oral administration by a trained examiner for visually impaired or severely inhibited clinical patients
• Administration Time: Typically 20 to 40 minutes (untimed; respondents are instructed to write the first thought that enters their mind without excessive deliberation)
• Stimulus Composition: Exactly 50 open-ended incomplete sentence stems presented in a standard, fixed sequence
• Response Modality: Free-response written verbal completions
• Scoring Methodology: Dual qualitative content analysis and semi-quantitative disturbance rating:
• Level 2 (Severe Disturbance): High conflict, severe maladjustment, pathological defensive failures.
• Level 1 (Mild Disturbance): Moderate or neurotic conflict, managed through recognizable, functional defenses.
• Level 0 (No Disturbance): Well-adjusted, adaptive, prosocial, realistic associations.
• Level X (Indeterminate): Evasive, clichéd, descriptive, or missing response.
• Diagnostic Output: A Clinical Interpretive Summary Sheet detailing ratings across Family, Sex, Interpersonal Relations, and Self-Concept, supplemented by a qualitative dynamic synthesis of the individual’s defense mechanisms and therapeutic prognosis.

Permissions & Fee and Test Year

The historical 50-item version of the Sacks Sentence Completion Test presented here originates from the year 1961 (with underlying developmental roots dating to Sacks & Levy, 1950). The test protocol is preserved within the Archives of the History of American Psychology at the University of Akron’s Cummings Center for the History of Psychology.

Licensing and Permissions: Under United States copyright doctrine, archival and historical psychological instruments developed in federal contexts (such as the Veterans Administration) or published during this era without renewed copyright are generally accessible for research, academic scholarship, historical study, and educational training without commercial licensing fees. Researchers and clinicians utilizing the instrument are permitted to reproduce and administer the items for non-commercial psychometric research, pedagogical demonstrations, and clinical evaluation, provided appropriate archival attribution is maintained. Commercial distribution or incorporation into proprietary electronic testing platforms requires consultation with relevant institutional archival repositories and copyright holders.

References

• Frank, L. K. (1939). Projective methods for the study of personality. The Journal of Psychology, 8(2), 389–413. https://doi.org/10.1080/00223980.1939.9917671
• Holaday, M., Smith, D. A., & Sherry, A. (2000). Sentence completion tests: A review of the literature and results of a survey of members of the Society for Personality Assessment. Journal of Personality Assessment, 74(3), 371–383. https://doi.org/10.1207/S15327752JPA7403_3
• Murstein, B. I. (1965). Handbook of Projective Techniques. Basic Books.
• Rapaport, D., Gill, M. M., & Schafer, R. (1946). Diagnostic Psychological Testing: The Theory, Statistical Evaluation, and Diagnostic Application of a Battery of Tests (Vol. 2). The Year Book Publishers.
• Rotter, J. B., & Rafferty, J. E. (1951). The Rotter Incomplete Sentences Blank manual: College form. Psychological Corporation.
• Sacks, J. M., & Levy, S. (1950). The Sentence Completion Test. In L. E. Abt & L. Bellak (Eds.), Projective Psychology: Clinical Approaches to the Total Personality (pp. 357–402). Alfred A. Knopf. https://doi.org/10.1037/11516-007
• Sullivan, H. S. (1953). The Interpersonal Theory of Psychiatry. W. W. Norton & Company.

Items of the Scale