Philosophies of Human Nature Scale

Abstract

The Philosophies of Human Nature Scale (PHN), developed by social psychologist Lawrence S. Wrightsman in 1964, is a foundational psychometric instrument designed to assess an individual's generalized beliefs and implicit assumptions regarding the fundamental qualities, behavioral propensities, and moral character of human beings. Operating within the conceptual framework of implicit personality theory, the instrument operationalizes human nature beliefs across six multidimensional constructs: Trustworthiness (the belief that people are honest, moral, and reliable), Altruism (the perception that people are unselfishly invested in the welfare of others), Independence (the belief that individuals maintain autonomy and resist group conformity), Strength of Will and Rationality (the conviction that individuals possess self-determination, agency, and rational control over their outcomes), Complexity (the degree to which human behavior is perceived as intricate, multifaceted, and difficult to comprehend), and Variability (the extent to which individuals are viewed as malleable across distinct situations and temporal contexts). The comprehensive scale comprises 84 Likert-type items evenly distributed across the six dimensions (14 items per subscale; 7 positively keyed and 7 reverse keyed). Responses are recorded along a balanced 6-point continuum ranging from +3 (I agree strongly) to -3 (I disagree strongly). Psychometric investigations across six decades have established that the four substantive evaluative subscales (Trustworthiness, Altruism, Independence, and Strength of Will) intercorrelate substantially to form a higher-order composite reflecting a positive-versus-negative (or optimistic-versus-cynical) worldview, whereas Complexity and Variability function as largely orthogonal structural-cognitive dimensions. The PHN demonstrates strong internal consistency (split-half reliability coefficients typically ranging from .70 to .85 across subscales) and robust test-retest stability (stability coefficients typically exceeding .75 over temporal intervals ranging from three weeks to several months). It has served as a benchmark measurement tool across social, organizational, educational, and political psychology, clarifying the cognitive schemata that govern interpersonal trust, prosocial cooperation, leadership styles, and attributional processes.

Keywords

Philosophies of Human Nature Scale, Lawrence S. Wrightsman, Interpersonal Trust, Implicit Personality Theory, Altruism, Human Nature Beliefs, Locus of Control, Psychometrics, Social Cognition, Cynicism, Personal Construct Theory, Scale Validation

Authors

The scale was conceptualized, operationalized, and validated by Lawrence S. Wrightsman, Jr., Ph.D. (1932–2019), a distinguished American social and forensic psychologist who spent the majority of his academic career at The University of Kansas (Lawrence, Kansas) and earlier at George Peabody College for Teachers (now part of Vanderbilt University, Nashville, Tennessee). Wrightsman earned his doctorate in psychology from the University of Minnesota and served as president of the Society for the Psychological Study of Social Issues (SPSSI, Division 9 of the American Psychological Association) and the American Psychology-Law Society (AP-LS, Division 41 of the APA). His scholarship pioneered empirical paradigms in social perception, legal decision-making, interpersonal trust, and adult personality development.

Purpose

The primary purpose of the Philosophies of Human Nature Scale is to provide an empirically grounded, nuanced, and psychometrically standardized inventory to measure the belief systems that individuals construct regarding human nature. Every person operates upon implicit assumptions about the motives, consistency, honesty, and agency of other people. These cognitive frameworks—termed by Wrightsman as one's "philosophy of human nature"—govern how individuals interpret ambiguous social cues, navigate cooperative or competitive dilemmas, assign praise or blame, and formulate personal and institutional policies.

Prior to Wrightsman's development of the PHN in 1964, psychological investigations of social trust, cynicism, and social worldview were predominantly unidimensional, fragmented, or embedded within psychopathological indices. For example, existing instruments such as the Minnesota Multiphasic Personality Inventory (MMPI) Cynicism subscale, Adorno et al.'s California F-scale (measuring authoritarian tendencies), and Machiavellianism inventories (Mach-IV) indexed negative or manipulative views of humanity, but failed to disentangle distinct components of benevolence, volition, complexity, and contextual variability. Wrightsman recognized that an individual might view human nature as deeply altruistic yet highly conformist, or view humanity as fundamentally honest yet cognitively simple and predictable. Thus, the PHN was engineered to decompose broad attitudes into discrete, measurable facets.

In clinical and counseling settings, the PHN enables practitioners to illuminate core maladaptive cognitive schemas. Therapeutic orientations such as Cognitive Behavioral Therapy (CBT) and Schema Therapy emphasize that deep-seated, dysfunctional beliefs about the untrustworthiness or exploitation of others can sustain chronic paranoia, interpersonal hostility, social anxiety, and therapeutic resistance. Administering the PHN provides clinicians with a standardized profile of a client's relational assumptions, facilitating targeted cognitive restructuring.

In organizational and leadership research, the PHN serves as an invaluable diagnostic for management philosophy. As Douglas McGregor proposed in his seminal Theory X and Theory Y framework, managerial behaviors reflect implicit beliefs regarding whether employees are innately indolent and self-serving (Theory X) or self-directed and cooperative (Theory Y). The PHN quantifies these organizational orientations, predicting delegation practices, employee surveillance, and conflict resolution modalities. Furthermore, in cross-cultural and political psychology, the scale has been widely utilized to examine ideological conservatism, systemic institutional trust, and attitudinal shifts across historical cohorts and socioeconomic transitions.

Psychological Construct

The overarching construct measured by the PHN is the multidimensional cognitive structure of assumptions about human nature. Wrightsman posited that an individual's philosophy of human nature consists of both evaluative-moral dimensions (concerning whether humans are fundamentally benevolent or malevolent) and cognitive-structural dimensions (concerning the degree of complexity and situational stability governing human action). The instrument articulates these perspectives into six specific, operationalized subscales:

1. Trustworthiness (T)

The Trustworthiness subscale gauges the extent to which an individual believes that other people are honest, moral, truthful, and dependable. Individuals scoring high on this dimension view others as fundamentally ethical actors who keep their promises, honor agreements, and refrain from deceit even when the probability of detection is minimal (e.g., "Most people can be counted on to tell the truth"). Conversely, low scorers endorse a cynical, suspicious worldview characterized by expectations of exploitation, opportunistic lying, and general deceit (e.g., "Most people will tell a lie if they could gain by it").

2. Altruism (A)

The Altruism subscale assesses the belief in unselfish human benevolence and mutual aid. High scorers maintain that people possess genuine concern for others, act with empathy, and are willing to expend personal resources or sacrifice their own comfort to assist those in distress (e.g., "People usually help others when they are in trouble"). Low scorers espouse a Hobbesian or egoistic perspective, believing that human actions are exclusively governed by personal gratification, material self-interest, and instrumental gain (e.g., "When you come right down to it, people are basically selfish").

3. Independence (I)

The Independence subscale measures assumptions regarding autonomy, moral fortitude, and conformity. It captures whether people are perceived as independent thinkers who have the courage to maintain their personal convictions against majority pressure (e.g., "Most people make up their own minds without depending on others"), or whether they are viewed as passive conformists who succumb to social expectations, peer pressure, and institutional authority (e.g., "Most people follow the crowd").

4. Strength of Will and Rationality (S)

This subscale evaluates beliefs regarding personal agency, cognitive rationality, and self-determination versus fatalism and helplessness. High scorers perceive humans as rational agents who exercise self-control, formulate deliberate life goals, and overcome environmental adversity through willpower (e.g., "Most people have the power to direct their own destinies"). Low scorers view human beings as irrational, impulse-driven organisms or victims of deterministic forces, destiny, luck, or environmental conditioning beyond their influence (e.g., "Most people have little control over the things that happen to them").

5. Complexity (C)

Complexity addresses the cognitive sophistication attributed to human psychology. High scorers perceive human nature as intricate, subtle, deep, and difficult to comprehend, acknowledging multifaceted motives and hidden psychological dynamics (e.g., "Human nature is so complex that it is almost impossible to understand"). Low scorers perceive human psychology as transparent, straightforward, uniform, and easily decipherable through rudimentary rules (e.g., "People are basically simple creatures with few deep complexities").

6. Variability (V)

The Variability subscale measures the degree to which human behavior is perceived as situationally malleable versus temporally and cross-situationally stable. High scorers view people as chameleonic agents whose actions fluctuate dramatically across different social contexts, relational partners, and temporal points (e.g., "A person's behavior changes from one situation to another"). Low scorers subscribe to an essentialist view of fixed behavioral consistency, maintaining that core personality traits persist invariably across diverse social settings (e.g., "People tend to act in the same way no matter what the situation").

Theoretical Framework

The theoretical architecture of the Philosophies of Human Nature Scale is anchored in social psychology, cognitive constructivism, and implicit personality theory. Drawing inspiration from Jerome Bruner and Renato Tagiuri's (1954) early conceptualization of person perception, Wrightsman posited that naïve observers do not perceive others in an objective, unbiased vacuum. Instead, individuals navigate the overwhelming stream of interpersonal data by relying on pre-existing, implicit belief systems regarding how personality characteristics coalesce and operate across human populations.

This formulation aligns closely with George Kelly's (1955) Personal Construct Theory, which posits that humans act as "personal scientists," interpreting reality through transparent patterns or cognitive templates (constructs) that they create and fit over the world. Wrightsman demonstrated that individuals possess durable, chronic constructs regarding the nature of the social collective. When interacting with an unfamiliar acquaintance, a manager engaging a subordinate, or a citizen evaluating a political policy, the person projects their philosophical assumptions onto the target, filling in informational voids and shaping subsequent behavioral expectancies.

Wrightsman's framework also intersects with Julian Rotter's (1954, 1967) Social Learning Theory, specifically the construct of generalized expectancies. Rotter asserted that when novel situations provide minimal immediate structure, behavior is determined by generalized trust expectancies—the subjective probability that the verbal or written promises of another individual or group can be relied upon. The PHN shares conceptual space with Rotter's Interpersonal Trust Scale (ITS), but Wrightsman broadened the scope beyond trust alone by arguing that interpersonal expectations are grounded in a broader matrix comprising perceived altruism, volitional capacity, behavioral variability, and psychological depth.

Philosophically, Wrightsman recognized that the historical continuum of Western and Eastern philosophy has long debated the fundamental goodness versus depravity of humanity. The evaluative subscales of the PHN operationalize historical dialectics: Thomas Hobbes' assertion that natural human life is "solitary, poor, nasty, brutish, and short" contrasted with Jean-Jacques Rousseau's romantic conception of the naturally virtuous individual corrupted by social institutions; or Niccolò Machiavelli's pragmatic cynicism contrasted with humanistic psychology's (e.g., Carl Rogers, Abraham Maslow) affirmation of self-actualizing, benevolent human potential.

Crucially, Wrightsman made an epistemological distinction between the evaluative orientation (Are humans good or bad?) and the structural-cognitive orientation (How complex and variable are humans?). By demonstrating that beliefs regarding human complexity and situational variability operate independently of beliefs regarding human moral benevolence, the theoretical model avoids the conflation of cognitive sophistication with ethical optimism.

Validity

Extensive psychometric investigations have established robust evidence for the construct, convergent, discriminant, and predictive validity of the Philosophies of Human Nature Scale across diverse populations.

Construct and Factorial Validity

In his initial validation studies, Wrightsman (1964) administered the 84-item instrument to broad undergraduate samples and observed a clear conceptual separation among the dimensions. Correlational analyses demonstrated that the four substantive evaluative subscales—Trustworthiness, Altruism, Independence, and Strength of Will—exhibited moderate to high intercorrelations with one another (intercorrelations typically spanning $r = .35$ to $r = .70$, $p < .001$). These shared variances justified their algebraic aggregation into a unified composite metric: the General Positive-Negative View of Human Nature (ranging from -168 to +168 algebraically, or 0 to 336 if scaled positively). In marked contrast, the Complexity and Variability subscales demonstrated near-zero correlations with the evaluative composite (correlations typically oscillating between $r = -.08$ and $r = .12$, non-significant), demonstrating that the perceived cognitive depth and behavioral malleability of people represent orthogonal, non-evaluative cognitive dimensions.

Convergent Validity

The convergent validity of the PHN has been substantiated through systematic comparisons with established psychological inventories:

• Interpersonal Trust: Wrightsman's Trustworthiness subscale demonstrates strong positive convergence with Rotter's Interpersonal Trust Scale (ITS), with reported correlation coefficients consistently ranging from $r = .58$ to $r = .74$ ($p < .001$), confirming that the PHN accurately captures generalized social trust.
• Machiavellianism: Studies correlating the PHN with Christie and Geis's Mach-IV scale reveal strong, statistically significant negative relationships. The Trustworthiness ($r = -.55$ to $-.68$) and Altruism ($r = -.48$ to $-.62$) subscales correlate inversely with Machiavellianism, indicating that individuals who score low on the PHN evaluative dimensions endorse manipulative, cynical, and opportunistic interpersonal strategies.
• Authoritarianism and Cynicism: The General Positive-Negative composite correlates negatively with Adorno et al.'s California F-scale ($r = -.38$ to $-.52$) and Rokeach's Dogmatism Scale, confirming that rigid, authoritarian belief systems are anchored in cynical appraisals of human benevolence and autonomy.

Discriminant Validity

The PHN exhibits robust discriminant validity against measures of general cognitive intelligence and social desirability response bias. Correlations between the six PHN subscales and the Marlowe-Crowne Social Desirability Scale (MCSDS) typically fall between $r = .05$ and $r = .18$, demonstrating that responses are not mere artifacts of impression management. Furthermore, the PHN demonstrates minimal overlap with standardized measures of scholastic aptitude (SAT/ACT) and non-verbal reasoning, verifying that beliefs about human nature reflect personality and ideological schemata rather than cognitive capability.

Predictive and Behavioral Validity

Behavioral experiments have confirmed that PHN scores predict real-world decision-making. In laboratory prisoner's dilemma games and public goods experiments, participants exhibiting high scores on Trustworthiness and Altruism initiate significantly more cooperative moves and sustain mutual cooperation even after isolated defections by partners. In organizational settings, managers scoring high in Independence and Strength of Will employ participatory leadership styles, whereas those with low scores favor coercive monitoring and rigid bureaucratic controls.

Reliability

The Philosophies of Human Nature Scale has demonstrated solid psychometric reliability across split-half internal consistency metrics, Cronbach's alpha estimations, and longitudinal test-retest investigations.

Internal Consistency

During scale construction, Wrightsman initially generated pools of 20 items per dimension, subjecting them to iterative item-total correlation screenings to eliminate ambiguous or nondiscriminating statements. The resulting 14-item subscales demonstrated satisfactory internal consistency across collegiate and community cohorts:

• Trustworthiness: Split-half reliability coefficients (Spearman-Brown corrected) typically range from $.74$ to $.84$; Cronbach's alpha values average approximately $.78$ to $.82$.
• Altruism: Split-half coefficients range from $.71$ to $.81$; alpha values average $.76$.
• Independence: Split-half coefficients range from $.68$ to $.78$; alpha values average $.72$.
• Strength of Will and Rationality: Split-half coefficients range from $.69$ to $.77$; alpha values average $.74$.
• Complexity: Split-half coefficients range from $.65$ to $.76$; alpha values average $.70$.
• Variability: Split-half coefficients range from $.64$ to $.75$; alpha values average $.69$.
• General Positive-Negative Composite (56 items): Due to the pooling of 56 intercorrelated evaluative items (T + A + I + S), the composite scale displays exceptional internal consistency, with Cronbach's alpha coefficients consistently exceeding $.90$ (typically $.90$ to $.93$).

Test-Retest Temporal Stability

Wrightsman (1964, 1974) and subsequent investigators evaluated the temporal stability of the PHN over varying longitudinal intervals:

• Over a three-month interval, test-retest reliability coefficients for the individual subscales ranged from $.70$ to $.83$, with the composite score demonstrating a stability coefficient of $r = .85$ ($p < .001$).
• Over a six-month to one-year interval, subscale stability coefficients remained robust, averaging between $r = .62$ and $r = .75$, demonstrating that philosophies of human nature function as stable, enduring personality traits rather than transient, fluctuating mood states.

Factor Analysis

Although Wrightsman's original 1964 monograph relied primarily on classical item-analysis procedures, criterion-keyed item discrimination indices, and bivariate correlation matrices rather than exploratory factor analysis (EFA), extensive subsequent factor analytic investigations have evaluated the internal latent architecture of the 84-item battery.

Exploratory Factor Structure

Subsequent exploratory factor analyses (e.g., Ashmore, 1970; Robinson & Shaver, 1973; Wrightsman, 1974) utilizing principal axis factoring and principal components analysis (PCA) with both Varimax (orthogonal) and Promax (oblique) rotations have consistently identified a robust two-factor higher-order structure:

• Factor I: Evaluative Orientation (Human Goodness vs. Cynicism): This primary factor accounts for the largest proportion of total common variance (often between 35% and 45%). The items from the Trustworthiness, Altruism, Independence, and Strength of Will subscales load heavily onto this dimension, with primary loadings frequently spanning $.45$ to $.72$. This factor confirms that ordinary individuals organize their moral appraisals of humanity along a broad evaluative continuum ranging from optimistic benevolence to cynical malevolence.
• Factor II: Structural-Cognitive Orientation (Human Complexity and Plasticity): The secondary factor accounts for approximately 12% to 18% of the common variance and is defined predominantly by items from the Complexity and Variability subscales. Loadings on this factor range between $.38$ and $.65$. This factor captures the cognitive sophistication and attributional tolerance an individual displays when modeling interpersonal behavior.

Confirmatory Factor Analytic (CFA) Findings

Contemporary confirmatory factor analytic studies testing Wrightsman's hypothesized six-factor correlated model against alternative models have yielded meaningful psychometric insights:

• A strict unidimensional model (forcing all 84 items onto a single latent factor) produces extremely poor fit indices (e.g., $\chi^2/df > 5.0$, CFI $< .60$, RMSEA $> .10$), confirming that the construct cannot be reduced to a single global dimension.
• A hierarchical (bifactor or higher-order) model—comprising a general Evaluative factor subsuming T, A, I, and S, alongside two distinct correlated factors for Complexity and Variability—demonstrates substantially improved and acceptable goodness-of-fit parameters (e.g., CFI $\approx .90$, TLI $\approx .88$, RMSEA $\approx .048$ to $.056$).
• Item loadings on individual designated subscales generally exceed $.40$, with minimal cross-loadings observed between the evaluative items and the structural items, confirming the structural validity of Wrightsman's multidimensional taxonomy.

Instrument / Measurement Tool

• Scale Name: Philosophies of Human Nature Scale (PHN)
• Alternative Names: Wrightsman's PHN Scale; Wrightsman Human Nature Scale
• Author: Lawrence S. Wrightsman, Jr.
• Year of Publication: 1964
• Instrument Type: Multidimensional self-report rating scale
• Constructs Assessed: Assumptions regarding human trustworthiness, altruism, independence, willpower/rationality, complexity, and variability
• Total Number of Items: 84 items
• Subscales (6 subscales of 14 items each):
  • Trustworthiness (T): Items 1, 7, 13, 19, 25, 31, 37, 43, 49, 55, 61, 67, 73, 79
  • Altruism (A): Items 2, 8, 14, 20, 26, 32, 38, 44, 50, 56, 62, 68, 74, 80
  • Independence (I): Items 3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75, 81
  • Strength of Will and Rationality (S): Items 4, 10, 16, 22, 28, 34, 40, 46, 52, 58, 64, 70, 76, 82
  • Complexity (C): Items 5, 11, 17, 23, 29, 35, 41, 47, 53, 59, 65, 71, 77, 83
  • Variability (V): Items 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84
• Response Scale (Mandatory 6-Point Likert Continuum):
  • +3: I agree strongly
  • +2: I agree somewhat
  • +1: I agree slightly
  • -1: I disagree slightly
  • -2: I disagree somewhat
  • -3: I disagree strongly
• Administration Method: Paper-and-pencil self-report or computer-assisted digital questionnaire
• Target Population: Adults and adolescents aged 18 years and older
• Estimated Completion Time: Approximately 15 to 25 minutes
• Scoring and Keying Procedures:
  • Each 14-item subscale contains exactly 7 positively keyed statements and 7 negatively keyed (reverse-scored) statements.
  • Reverse-scored items are inverted by multiplying the score by $-1$ (e.g., a response of $+3$ becomes $-3$; $-2$ becomes $+2$).
  • Subscale Scores: Calculated by algebraically summing the 14 keyed item responses. Subscale totals range from -42 to +42. Alternatively, researchers may add a constant of 42 to shift the subscale range to 0 to 84, or convert to a 1–6 mean metric.
  • Composite Score (General Positive-Negative View of Human Nature): Derived by summing the four evaluative subscales ($T + A + I + S$). Composite scores range from -168 to +168 (or 0 to 336 under linear positive transposition). High positive scores reflect an optimistic, trusting view of humanity, while negative scores reflect cynical, pessimistic assumptions.
  • Complexity (C) and Variability (V) Scores: Retained and analyzed separately as independent cognitive structural dimensions.

Permissions & Fee and Test Year

The Philosophies of Human Nature Scale was initially published in 1964 by Lawrence S. Wrightsman, Jr., in the peer-reviewed journal Psychological Reports (Wrightsman, 1964), followed by comprehensive psychometric treatments in his 1974 monograph, Assumptions About Human Nature: A Social-Psychological Approach (published by Brooks/Cole). The instrument is considered an open, non-commercial psychological assessment tool available for academic, scientific, clinical, and non-commercial educational research without licensing fees.

While the scale is non-commercial, standard academic ethical guidelines require that investigators properly attribute and cite the original publications (Wrightsman, 1964, 1974) when utilizing the inventory in research publications, dissertations, or psychometric evaluations. No formal commercial permission or test purchase is required for non-commercial scholarly research.

References

• Ashmore, R. D. (1970). The relationship between philosophies of human nature and political attitudes. Journal of Social Issues, 26(3), 115–129. https://doi.org/10.1111/j.1540-4560.1970.tb01865.x
• Bruner, J. S., & Tagiuri, R. (1954). The perception of people. In G. Lindzey (Ed.), Handbook of Social Psychology (Vol. 2, pp. 634–654). Addison-Wesley.
• Christie, R., & Geis, F. L. (1970). Studies in Machiavellianism. Academic Press. https://doi.org/10.1016/C2013-0-07759-4
• Kelly, G. A. (1955). The Psychology of Personal Constructs (Vols. 1 & 2). W. W. Norton & Company.
• Robinson, J. P., & Shaver, P. R. (1973). Measures of Social Psychological Attitudes (Revised ed.). Institute for Social Research, University of Michigan.
• Rotter, J. B. (1954). Social Learning and Clinical Psychology. Prentice-Hall. https://doi.org/10.1037/10788-000
• Rotter, J. B. (1967). A new scale for the measurement of interpersonal trust. Journal of Personality, 35(4), 651–665. https://doi.org/10.1111/j.1467-6494.1967.tb01454.x
• Schneider, D. J. (1973). Implicit personality theory: A review. Psychological Bulletin, 79(5), 294–309. https://doi.org/10.1037/h0034496
• Wrightsman, L. S., Jr. (1964). Measurement of philosophies of human nature. Psychological Reports, 14(3), 743–751. https://doi.org/10.2466/pr0.1964.14.3.743
• Wrightsman, L. S. (1974). Assumptions About Human Nature: A Social-Psychological Approach. Brooks/Cole Publishing Company.

13. Items of the Scale (Questionnaire)