Posttherapy Estimate of Change in Integration (PECI)

Abstract

The Posttherapy Estimate of Change in Integration (PECI; Cartwright et al., 1961) is an archival, clinician-rated psychometric instrument designed to evaluate therapeutic progress through the lens of structural personality reorganization. Developed within the prolific empirical research milieu of the University of Chicago Counseling Center during the ascendancy of client-centered therapy, the PECI operationalizes the Rogerian construct of “personal integration”—the degree of congruence, internal harmony, and self-acceptance attained by a client over the course of psychotherapy. Comprising exactly two focal items rated on four-point Likert-type scales, the instrument captures two essential dimensions of humanistic therapeutic outcome: (1) subjective-affective shift in self-regard (evaluating changes in the client’s feelings toward themselves) and (2) global organismic restructuring (assessing the magnitude of structural change in the client as a total person). Psychometrically, the PECI was validated against both process-derived behavioral indices and independent outcome metrics. Most notably, it demonstrated substantial convergent validity with the Difference Measure of Change in Integration (DMCI)—a pre-to-post comparative metric derived from verbatim interview analysis—and displayed robust correlations with global therapist ratings of therapy success. Despite its ultra-brief architecture, the PECI occupies a notable place in the history of psychotherapy outcome research, illustrating early efforts to quantify complex, non-symptom-reduction paradigms of psychological health through standardized observer ratings.

Keywords

Posttherapy Estimate of Change in Integration, PECI, personal integration, client-centered therapy, psychotherapy outcome assessment, Rogerian psychometrics, therapist rating scale, self-congruence, structural personality change, Donald W. Fiske, Desmond S. Cartwright, humanistic measurement

Authors

The Posttherapy Estimate of Change in Integration was conceptualized and validated by a distinguished team of clinical psychologists and measurement theorists associated with the University of Chicago Counseling Center:

• Desmond S. Cartwright, Ph.D. — A prominent personality researcher and clinical methodologist who conducted foundational investigations into client-centered psychotherapy process and outcome, later serving as Professor of Psychology at the University of Colorado Boulder.
• Richard J. Robertson, Ph.D. — Clinical psychologist and research associate at the University of Chicago Counseling Center, specializing in therapeutic process evaluation and counseling dynamics.
• Donald W. Fiske, Ph.D. (1916–2003) — Renowned psychometrician and Professor of Psychology at the University of Chicago. Globally recognized for co-formulating the Multitrait-Multimethod Matrix (MTMM) alongside Donald T. Campbell (1959), Fiske applied rigorous measurement theory to the evaluation of personality, observer methodology, and psychotherapy outcomes.
• William L. Kirtner, Ph.D. — Clinical researcher whose empirical work focused on client typologies, therapeutic readiness, and short-term versus long-term process markers in client-centered counseling.

Purpose

The primary clinical and research objective of the Posttherapy Estimate of Change in Integration is to quantify the treating clinician’s holistic assessment of a client’s personality reorganization upon the termination of psychotherapy. In the mid-twentieth century, psychotherapy research was undergoing a methodological paradigm shift: moving away from unstandardized clinical impressions toward systematic, empirical quantification. However, dominant psychiatric evaluation tools focused almost exclusively on symptom alleviation, psychiatric nosology, or the diminution of manifest pathology. For researchers and practitioners operating within humanistic, phenomenological, and client-centered frameworks, these pathology-centric metrics failed to capture the actual goal of intervention: the holistic integration of the self.

Carl Rogers and his contemporaries hypothesized that successful psychotherapy does not merely eliminate discrete complaints, such as localized anxiety or situational inhibition; rather, it facilitates a structural realignment between the phenomenal self and organismic experience. Under this theoretical orientation, an individual becomes more internally unified, self-accepting, open to experience, and psychologically flexible. The PECI was developed specifically to provide an economical, standardized rating system allowing therapists to encapsulate this overarching transformation immediately after concluding therapy.

In clinical research, the instrument serves multiple key functions:

• Assessment of Structural Versus Symptomatic Change: The PECI moves beyond surface-level behavioral modifications to assess whether the client has achieved enduring, systemic changes in self-structure and self-attitude.
• Therapy Dosage and Outcome Investigations: The tool was originally utilized to systematically interrogate the relationship between the duration of counseling (number of sessions) and the depth of structural personality change, helping to discern whether true integration requires extended interventions or can occur in briefer engagements.
• Triangulation in Multimethod Outcome Batteries: In alignment with Fiske’s multitrait-multimethod principles, the PECI provides a vital clinician-perspective data point to balance client self-reports (such as the Butler-Haigh Q-sort) and blind external judge ratings (such as process ratings of recorded interviews).

Psychological Construct

The psychological construct assessed by the PECI is Integration Change (specifically, change in personal integration). In classical clinical personality theory, “integration” refers to the degree to which an individual’s disparate motives, self-perceptions, somatic awareness, and conscious values function in harmonious synthesis rather than defensive compartmentalization. The PECI operationalizes this construct across two interlinked dimensions:

1. Evaluative-Affective Self-Regard

The first item of the PECI evaluates the directional shift in how the client emotionally experiences, appraises, and values their own identity. In individuals experiencing psychological maladjustment, self-regard is typically characterized by deep-seated conditional acceptance, severe self-criticism, internal discord, and chronic discontentment. Maladjusted individuals often perceive a painful disparity between who they believe they are (the perceived self) and who they feel they ought to be (the ideal self).

When psychological integration improves, the individual develops enhanced unconditional self-regard. This shift is not merely the adoption of superficial optimism; rather, it reflects genuine self-acceptance, compassion toward one’s limitations, and an alleviation of internal self-punitive hostility. The PECI captures this continuum by asking the counselor to evaluate whether the client has transitioned from alienation and discontentment toward authentic contentment and internal self-reconciliation.

2. Global Structural Personality Reorganization

The second item captures the magnitude of change occurring within the client “as a person.” This dimension reflects the foundational distinction between superficial, first-order behavioral adjustments and profound, second-order personality reorganization. A client may acquire specific behavioral coping skills or adjust to a transient life crisis without experiencing fundamental shifts in their personality architecture. Conversely, deep integration entails changes in the client’s foundational frame of reference, cognitive schemas, emotional openness, and interpersonal relating styles.

By measuring the extent of transformation in the client as a total organism, the PECI targets the degree to which defensive barriers have dissolved, allowing the individual to operate with higher psychological maturity, autonomy, and organismic congruence. Together, these two dimensions operationalize integration not as a static state, but as dynamic movement toward fully functioning psychological health.

Theoretical Framework

The PECI is anchored in the organismic, phenomenological theory of personality developed by Carl Rogers (1951, 1959). Rogerian theory postulates an innate developmental trajectory termed the actualizing tendency—an inherent orientation toward growth, differentiation, and holistic integration. According to this model, psychological maladjustment emerges when significant others impose conditional positive regard, causing the developing person to internalize “conditions of worth.”

To preserve positive regard, the individual incorporates perceptions that are incongruent with their raw sensory and visceral experiences. Threatening feelings, impulses, and experiences are distorted or denied awareness through perceptual defense mechanisms. This produces a fragmented, defensive personality structure characterized by incongruence between the phenomenal self-concept and the broader organismic experience. The individual experiences internal tension, chronic vulnerability, and diminished personal integration.

Within the relational sanctuary of client-centered therapy—defined by the therapist’s accurate empathy, unconditional positive regard, and congruence—the client gradually lowers their defensive thresholds. Experiences that were previously perceived as intolerable can be symbolized accurately and assimilated into an expanded, unified self-concept. As incongruence diminishes, personal integration rises.

Additionally, the PECI reflects Donald W. Fiske’s rigorous methodological epistemology. Fiske posited that any psychological construct evaluated solely through one observational perspective (e.g., self-report) is inherently confounded by method variance. Clinician judgments, while subject to their own cognitive heuristics, possess distinct ecological validity because the therapist directly witnesses the client’s emotional trajectory, defenses, and authentic interpersonal behaviors across significant spans of time. The PECI constitutes an intentional effort to capture this unique clinical perspective in a parsimonious, standardized psychometric form.

Validity

Despite consisting of only two items, the PECI was subjected to empirical validation during the University of Chicago Counseling Center studies examining therapy duration, process characteristics, and outcome (Cartwright et al., 1961).

Convergent and Criterion Validity

The primary validation strategy for the PECI involved examining its convergence with an objective, process-derived measure of integration: the Difference Measure of Change in Integration (DMCI). The DMCI was calculated by analyzing verbatim transcriptions of the client’s first and final therapeutic interviews. Blind external judges scored these interviews using standardized operational criteria for integrated versus unintegrated speech, self-referential statements, and defensive posturing. The difference score between the opening and terminal interview provided an external, behavioral index of personal integration change.

Empirical analyses demonstrated that the PECI, completed independently by the treating therapist upon case closure, exhibited statistically significant, robust correlations with the DMCI. This convergence verified that the therapist’s retrospective rating was not simply reflective of halo effects or clinical optimism, but corresponded directly with linguistic and behavioral manifestations of integration observed by independent, blinded raters.

Relationship with Global Therapeutic Success

Cartwright and colleagues (1961) also examined the relationship between the PECI and comprehensive ratings of overall therapy success. Therapists completed a broader global outcome scale evaluating whether the intervention had achieved its overarching clinical goals. The PECI correlated strongly with these global success ratings, establishing that clinicians view positive personality integration as a central, indispensable component of overall successful psychotherapy outcome rather than an incidental byproduct.

Discriminant Patterns in Relation to Therapy Length

In the seminal 1961 study, the PECI was deployed to investigate the clinical question of whether therapeutic gains are linear functions of session count. Interestingly, while the PECI correlated positively with duration across short- and medium-term cohorts, it also successfully captured meaningful integration gains in clients who participated in comparatively brief therapies but exhibited high initial motivation and rapid therapeutic engagement. This sensitivity demonstrated that the PECI was measuring substantive psychological movement rather than functioning merely as an indirect proxy for elapsed treatment time.

Reliability

Classical psychometric reliability protocols present unique conceptual challenges when applied to retrospective posttherapy clinician ratings:

• Internal Consistency: With a two-item structure, traditional metrics such as Cronbach’s alpha are constrained by test length, as alpha is intrinsically dependent upon the total number of items. In micro-scales of this nature, the primary index of internal coherence is the inter-item correlation between the affective dimension (Item 1) and the structural dimension (Item 2). In empirical use, these items display strong inter-item concordance, reflecting their common saturation with the underlying integration factor.
• Test-Retest Stability: Traditional test-retest reliability is inherently inapplicable to a posttherapy rating scale designed to capture a completed historical trajectory of change. Repeating the rating weeks after termination would measure therapist memory decay and retrospective distortion rather than psychometric stability.
• Inter-Rater Reliability: Because the PECI was designed specifically for the treating clinician who possessed longitudinal, intimate exposure to the client’s internal phenomenal world, routine cross-clinician inter-rater paradigms were not embedded in the initial study design. However, the strong statistical correspondence between the clinician-completed PECI and the independent, multi-rater DMCI provides an indirect form of inter-method reliability, demonstrating that the variance captured by the treating therapist systematically aligns with outside observational consensus.

Factor Analysis

At the time of the scale’s development in 1961, formal exploratory factor analysis (EFA) and modern confirmatory factor analysis (CFA) were rarely computed on two-item rating forms due to mathematical identification limits. A two-item scale provides only three distinct pieces of empirical information in a covariance matrix (two variances and one covariance), which is mathematically insufficient to identify an over-determined latent factor model without imposing strict equality constraints on the factor loadings.

From the standpoint of modern structural equation modeling (SEM) and latent variable theory:

• Latent Dimensionality: The PECI functions as an essentially tau-equivalent or congeneric two-indicator model representing a single unidimensional latent construct: Perceived Integration Change.
• Indicator Roles: Item 1 serves as the affective-evaluative manifest indicator (evaluating self-feeling shifts), while Item 2 serves as the structural-macro manifest indicator (evaluating holistic personal change). Both items load heavily onto the central integration factor.
• Residual Covariance: Because both questions are completed by the same informant at the identical measurement point using matched 4-point response formats, contemporary structural models would acknowledge shared method variance across the pair, reinforcing the practice of summing or averaging the two items into a single composite index of change.

Instrument / Measurement Tool

Below are the structural, operational, and administrative parameters of the Posttherapy Estimate of Change in Integration:

• Instrument Name: Posttherapy Estimate of Change in Integration (PECI)
• Original Publication Year: 1961
• Authors: Desmond S. Cartwright, Richard J. Robertson, Donald W. Fiske, and William L. Kirtner
• Instrument Type: Clinician/Counselor-Rated Post-Treatment Evaluation Scale
• Primary Target Population: Adolescent and adult psychotherapy outpatients
• Intended Respondent: The primary psychotherapist or counselor immediately upon termination of treatment
• Item Count: 2 items
• Response Format: 4-point Likert-type scales with custom semantic anchors for each item
• Administration Time: Approximately 1 to 2 minutes
• Scoring Methodology:
  • Each item is assigned an ordinal score ranging from 1 to 4.
  • Total Score: Calculated by summing the two item scores (range: 2 to 8) or computing an average item score (range: 1.0 to 4.0).
  • Interpretation: Higher scores signify greater perceived personal integration, heightened self-acceptance, and profound structural personality reorganization over the course of counseling. Lower scores denote absent or negative change (e.g., increased self-discontentment or stagnation).

Permissions & Fee and Test Year

The Posttherapy Estimate of Change in Integration was developed in 1961 as an empirical research tool at the University of Chicago Counseling Center and published in the Journal of Consulting Psychology (now the Journal of Consulting and Clinical Psychology) by the American Psychological Association (APA). The complete scale items and response anchors were published directly within the public academic literature (Cartwright et al., 1961).

In accordance with standard historical research norms, the scale is not commercially distributed, requires no purchase fees, and is accessible for scholarly, scientific, and educational research purposes under academic fair-use guidelines, provided appropriate scholarly attribution is given to the original authors and the APA.

References

• Campbell, D. T., & Fiske, D. W. (1959). Convergent and discriminant validation by the multitrait-multimethod matrix. Psychological Bulletin, 56(2), 81–105. https://doi.org/10.1037/h0046016
• Cartwright, D. S., Robertson, R. J., Fiske, D. W., & Kirtner, W. L. (1961). Length of therapy in relation to outcome and change in personal integration. Journal of Consulting Psychology, 25(1), 84–88. https://doi.org/10.1037/h0040973
• Rogers, C. R. (1951). Client-centered therapy: Its current practice, implications, and theory. Houghton Mifflin.
• Rogers, C. R. (1959). A theory of therapy, personality, and interpersonal relationships as developed in the client-centered framework. In S. Koch (Ed.), Psychology: A study of a science (Vol. 3: Formulations of the person and the social context) (pp. 184–256). McGraw-Hill.
• Rogers, C. R., & Dymond, R. F. (Eds.). (1954). Psychotherapy and personality change: Co-ordinated research studies in the client-centered approach. University of Chicago Press.

Items of the Scale