California Psychological Inventory (CPI)

Abstract

The California Psychological Inventory (CPI), originally known as the California Personality Inventory, is a widely used self-report assessment tool developed by Harrison G. Gough. It was specifically designed to evaluate the personality characteristics and social competence of mentally healthy individuals, distinguishing it from clinical measures. The original version comprised 472 True/False items, approximately half of which were adapted directly from the Minnesota Multiphasic Personality Inventory (MMPI). Revised versions of the CPI are typically shorter.

The instrument yields scores across 20 primary scales focusing on interpersonal skills, social maturity, achievement potential, and dispositional characteristics. The CPI focuses on “folk concepts” of personality—traits commonly used in natural language to describe people (e.g., dominance, sociability, responsibility). The entire test requires approximately 50 to 60 minutes for completion.

Keywords

California Psychological Inventory, CPI, personality assessment, Gough, social competence, achievement, folk concepts, MMPI, psychological construct, self-report inventory.

Authors

Harrison G. Gough

Purpose

The primary purpose of the California Psychological Inventory (CPI) is to provide a detailed, non-pathological description of an individual’s social interaction style and personal characteristics relevant to everyday life. Unlike inventories focused on psychopathology, the CPI is centered on “folk concepts” of personality, which are the characteristics people use to describe themselves and others in daily social settings.

The CPI is frequently utilized in various applied settings. It is employed in organizational psychology for employee selection and development, in educational counseling to assess academic potential (particularly through the Achievement via Conformance and Achievement via Independence scales), and in research focused on social behavior, leadership, and cross-cultural comparisons. The instrument aims to predict how individuals will behave in specific social and interpersonal contexts based on their enduring traits.

Construct

The CPI measures enduring personality traits and dispositions related to social living and competency. The constructs are conceptually organized into categories, although the inventory reports on 20 distinct scales. These categories typically include Measures of Poise, Self-Assurance, and Interpersonal Adequacy (e.g., Dominance, Sociability); Measures of Normative Orientation and Values (e.g., Responsibility, Socialization); Measures of Cognitive and Intellectual Functioning (e.g., Intellectual Efficiency); and Measures of Temperament, Style, and Personal Orientation (e.g., Flexibility).

The structure of the CPI has been extensively compared to the Five-Factor Model (FFM). Research by McCrae, Costa, and Piedmont (1993) demonstrated meaningful conceptual and correlational links between the CPI scales and four of the five FFM factors. This analysis confirmed that the CPI measures robust psychological dimensions, though the factor of Agreeableness appeared to be underrepresented within the scope of the CPI scales.

Validity

Validity for the California Psychological Inventory is strongly supported through extensive criterion-related studies, which confirm its ability to predict real-world outcomes such as academic performance, leadership success, and occupational fit. The initial development of the instrument relied heavily on empirical item selection, whereby items were chosen based on their proven ability to differentiate between groups defined by external criteria (e.g., successful vs. unsuccessful leaders).

Furthermore, evidence of construct validity is provided through its consistent alignment with other established models. The conceptual mapping of CPI scales onto the Five-Factor Model (McCrae et al., 1993) confirms that the CPI assesses established and theoretically sound psychological constructs, further reinforcing the convergent validity of the inventory.

Reliability

The reliability of the CPI is assessed through measures of temporal stability (test-retest reliability) and internal consistency. Across diverse samples and standard retest intervals, the core CPI scales generally demonstrate strong stability, with test-retest correlations typically ranging from the upper .60s to the low .90s, indicating that the inventory provides consistent measurement of stable traits over time.

Internal consistency estimates (such as Cronbach’s alpha) vary across the 20 primary scales, reflecting that some scales were constructed using empirical methods that prioritize predictive power over internal homogeneity. Despite this variation, psychometric reviews generally conclude that the CPI maintains acceptable levels of reliability for both research applications and professional assessment contexts, especially given its broad coverage of social and personal dimensions.

Factor Analysis

Initial factor analysis of the CPI often identified two major dimensions, frequently interpreted as reflecting Extraversion (or social confidence) and Conventionality (or adherence to norms). However, subsequent research has explored the instrument’s structure in greater detail.

Loehlin (1982) conducted a significant study using data from a twin sample, deriving seven orthogonal factor scales from the CPI item pool. This analysis revealed statistically significant differences in heritability across these seven specific scales, as well as differences in the effects of common family environment. Loehlin concluded that differences in the heritability of personality scales can be demonstrated by investigating dimensions independent of the highly pervasive factors of Extraversion and Neuroticism, suggesting that the CPI successfully captures unique, heritable variance beyond the most commonly measured factors in typical personality inventories.

Instrument

Test Type: Self-report personality inventory

Format: True/False dichotomous response format

Language Available: English (and numerous translations are available commercially)

Population Group: Non-clinical (mentally healthy) adults and adolescents

Age Group: Typically 13 years and older

Population Details: The CPI is designed for use with the general population, focusing on social functioning, interpersonal competence, and potential for achievement. It is widely applied in industrial, organizational, and educational psychology settings.

Test Methodology: Standardized self-administration, requiring approximately 50 to 60 minutes for the full inventory. Scoring is standardized, yielding scores on 20 primary scales and three “vector” scales that provide a high-level summary of the individual’s style and motivation.

Keywords

Gough, Harrison G., psychological assessment, social heritability, Five-Factor Model, psychometrics, dominance, responsibility, achievement motivation, occupational psychology.

Authors

Author ORCID Identifier: N/A

Affiliation Email addresses: N/A

Correspondence Address: N/A

Permissions & Fee and Test Year

The California Psychological Inventory (CPI) is a proprietary instrument and is available for purchase through authorized psychological test publishers. Professional use typically requires specific training and certification in psychological assessment. The scale was first published in 1951, with significant revisions occurring in 1987 and 1996, resulting in the contemporary CPI 434 and CPI 260 versions.

Reference’s

• Gough, H. G. (1951). The California Psychological Inventory. Berkeley, California: The University of California Press.

• Craik, K. H. (1986). Personality research methods: An historical perspective. Journal of Personality, 54, 18-51.

• Loehlin, J. C. (1982). Are personality traits differentially heritable? Behavioral Genetics, 12, 417-428.

• McCrae, R. R., Costa, P. T., & Piedmont, R. L. (1993). Folk concepts, natural language, and psychological constructs: The California Psychological Inventory and the Five-Factor Model. Journal of Personality, 61, 1-26.

• Hathaway, S. R., & McKinley, J. C. (1943). Minnesota Multiphasic Personality Inventory. Minneapolis: University of Minnesota Press.

Items of the California Psychological Inventory (CPI)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The CPI is divided into the following scales:

Female/Male 32 items Mindedness

Flexibility 28 items