Measures of Interpersonal Attraction: (Old versions)

1. Abstract

The Interpersonal Attraction Scale (IAS), originally formulated and validated by James C. McCroskey and Thomas A. McCain in 1972 and formally published in 1974, represents a foundational psychometric instrument within interpersonal communication, social psychology, and relational dynamics. Designed to move beyond unidimensional conceptualizations of liking and social evaluation, the scale conceptualizes interpersonal attraction as a robust multidimensional construct comprising three distinct domains: Social Attraction (the desire to form personal friendships and socialize), Physical Attraction (appraisals of aesthetic appeal and physical presentation), and Task Attraction (evaluations of an individual’s competence, dependability, and desirability as a collaborative coworker or team partner). The initial measurement paradigm consisted of an expanded 30-item exploratory battery that was subsequently refined into widely implemented 18-item (six items per dimension) and 15-item (five items per dimension) self-report inventories. Responses are commonly scored across five-point or seven-point Likert-type scales ranging from “Strongly Disagree” to “Strongly Agree.” Psychometric investigations have repeatedly documented strong internal consistency across the three subscales, with Cronbach’s alpha coefficients routinely exceeding .75 for Social Attraction, .80 for Physical Attraction, and .86 for Task Attraction. Exploratory and confirmatory factor analyses consistently substantiate a three-factor orthogonal or oblique structure, demonstrating exceptional construct, convergent, and discriminant validity across diverse instructional, organizational, peer-group, and mediated communication contexts. The scale has provided critical empirical insights into source credibility, homophily, classroom instructional rapport, supervisor-subordinate relations, and parasocial interaction. This article provides an exhaustive psychometric examination of the early versions of McCroskey and McCain’s Interpersonal Attraction Scale, detailing its theoretical heritage, latent structural properties, scoring mechanisms, and operational administration.

2. Keywords

Interpersonal Attraction Scale, James C. McCroskey, Thomas A. McCain, social attraction, physical attraction, task attraction, interpersonal communication, source evaluation, psychometrics, relational communication

3. Authors

The scale was developed by two prominent communication scholars whose work fundamentally shaped mid-to-late twentieth-century communication science:

• James C. McCroskey, Ed.D. (1938–2012): One of the most prolific scholars in the discipline of human communication. At the time of the instrument’s initial development and formal publication, McCroskey served as Professor and Chair of the Department of Speech Communication at West Virginia University (Morgantown, West Virginia, United States). Renowned for pioneering research in communication apprehension, instructional communication, teacher nonverbal immediacy, and source credibility, McCroskey authored over 200 journal articles, books, and validated psychometric scales.
• Thomas A. McCain, Ph.D.: Co-developer of the scale, McCain was affiliated with the Department of Communication at Illinois State University (Normal, Illinois, United States) during the scale’s inception and subsequent validation phases, later serving as a distinguished faculty member in the School of Communication at The Ohio State University (Columbus, Ohio, United States). His scholarly expertise centered on interpersonal communication, nonverbal behavior, mediated interaction, and mass communication processes.

4. Purpose

The primary purpose of the Measures of Interpersonal Attraction (IAS) developed by McCroskey and McCain (1974) was to resolve a longstanding psychometric and theoretical deficiency in social psychological research: the oversimplification of human interpersonal attraction as a global, unitary sentiment. Historically, pioneering research by social psychologists such as Donn Byrne operationalized interpersonal attraction primarily through single-item or unidimensional affective evaluations, typified by Byrne’s Interpersonal Judgment Scale (IJS), which collapsed attraction into general liking and willingness to work with an individual.

McCroskey and McCain contended that interpersonal attraction is inherently multifaceted. In human social ecology, individuals systematically differentiate between those they find aesthetically pleasing, those with whom they desire reciprocal personal friendship, and those with whom they prefer to complete instrumental goals. For instance, an individual might perceive a colleague as exceptionally competent and reliable for completing complex tasks (high task attraction) while simultaneously disliking their aesthetic presentation (low physical attraction) or possessing zero desire to socialize with them outside of work (low social attraction). Conversely, an individual might find a peer profoundly pleasant and socially engaging (high social attraction) while recognizing their complete lack of dependability in high-stakes professional collaborations (low task attraction). By bifurcating and measuring these distinct orientations, the scale provides a nuanced diagnostic tool.

In research contexts, the instrument serves as an indispensable dependent, mediating, or independent variable in experimental and correlational designs exploring:

• Organizational Communication: Assessing leader-member exchange (LMX), employee peer appraisal, recruitment interviews, and cross-functional team formation.
• Instructional Communication: Evaluating teacher immediacy, student motivation, course evaluations, and classroom dynamics.
• Mass and Mediated Communication: Quantifying parasocial interaction, audience perceptions of broadcast news anchors, celebrity endorsements, and social media influencers.
• Clinical and Counseling Psychology: Diagnosing interpersonal relationship deficits, social anxiety barriers, peer rejection patterns, and dyadic satisfaction.

5. Psychological Construct

Interpersonal attraction is conceptualized within this measurement framework as a cognitive-affective evaluation rendered by an observer (the perceiver) toward a target individual along three discrete dimensions. Rather than reflecting an inherent personality trait of the perceiver or an objective physical characteristic of the target, attraction is operationalized as a relational orientation emerging from dyadic perception.

Social Attraction

Social attraction reflects an individual’s evaluation of another person as a potential companion, friend, and confidant. It assesses the perceived ease, comfort, and desirability of integrating the target into one’s existing social sphere. The underlying psychological construct encapsulates relational approach behaviors, conversational warmth, and subjective feelings of informal affinity. Prototypical high social attraction is reflected in judgments such as believing the person “could be a friend of mine” and perceiving that having a “friendly chat” with them would be rewarding. Low social attraction, conversely, is characterized by perceived relational incompatibility, discomfort, and the subjective belief that the target would not integrate smoothly into one’s social circles.

Physical Attraction

Physical attraction measures the aesthetic appeal, visual pleasantness, and physical presentation of the target individual. Grounded in evolutionary psychology and social perception literature, this construct captures both conventional aesthetic judgments (e.g., assessing whether the person is handsome, pretty, or sexy) and broader evaluations of personal grooming, sartorial style, and physical demeanor. The construct does not exclusively tap sexual desire; rather, it reflects a broad spectrum of visual valence. Higher scores signify strong aesthetic pleasure and positive evaluations of physical appearance, whereas lower scores denote negative aesthetic appraisals, such as perceiving the individual as unappealing or unkempt.

Task Attraction

Task attraction reflects an instrumental, utilitarian evaluation of the target’s competence, dependability, conscientiousness, and utility as a partner in shared goal attainment. In collaborative settings—such as business teams, academic study groups, or project committees—perceivers evaluate others based on whether they are perceived as industrious or a “goof-off,” whether they exhibit problem-solving acumen, and whether they can be counted on to deliver results. High task attraction indicates pronounced confidence in the target’s collaborative capacity, whereas low task attraction reflects expectations of inefficiency, unreliability, and frustration during cooperative tasks.

6. Theoretical Framework

The conceptual architecture of McCroskey and McCain’s Interpersonal Attraction Scale is anchored in multiple foundational theories of social psychology and human communication:

Social Exchange Theory

Originating in the sociological and economic frameworks of George C. Homans (1958) and expanded by John Thibaut and Harold Kelley (1959), Social Exchange Theory posits that human interactions are transactional processes based on a subjective cost-benefit calculus. Interpersonal attraction operates as an anticipatory appraisal of relational rewards versus costs. Task attraction captures prospective instrumental rewards (e.g., project success, reduced labor burden); social attraction assesses affective and emotional rewards (e.g., companionship, validation, emotional safety); and physical attraction taps sensory, visual, and status-enhancing rewards associated with social proximity to aesthetically valued individuals.

The “What is Beautiful is Good” Stereotype

Dion, Berscheid, and Walster (1972) articulated the halo effect governing physical attractiveness, demonstrating that individuals who are perceived as physically attractive are routinely credited with socially desirable personality traits, professional success, and happiness. McCroskey and McCain developed their multidimensional instrument partly to empirically isolate and test this phenomenon. By decoupling physical attraction from social and task attraction into separate subscales, researchers could rigorously examine the degree to which visual appraisals spill over into evaluations of intellectual competence or moral character.

Constructivism and Implicit Personality Theory

According to implicit personality theory (Solomon Asch, 1946; Lee Cronbach, 1955), perceivers organize cognitive impressions of others through structured systems of interrelated attributes. McCroskey and McCain drew heavily upon psycholinguistic trait attribution paradigms, arguing that interpersonal attraction forms a core component of how human perceivers construct cognitive impressions of social actors. These cognitive categorizations dictate relational trajectory choices: whether to initiate contact, collaborate professionally, or avoid interaction altogether.

7. Validity

Extensive empirical investigations over five decades have established robust validity metrics for the Interpersonal Attraction Scale across multiple domains:

Construct and Factorial Validity

Initial validation studies conducted by McCroskey and McCain (1974) with undergraduate cohorts (N = 215 in exploratory phases; N = 184 in confirmatory cross-validation phases) confirmed that the items reliably resolved into three distinct dimensions rather than a single general evaluative factor. Across independent samples evaluating known peers, public figures, and unacquainted strangers, the three-factor solution accounted for the vast majority of common variance. Discriminant validity among the subscales was substantiated by low-to-moderate inter-factor correlations (typically ranging from r = .20 to r = .45), demonstrating that while the dimensions share common relational variance, they represent non-redundant, distinct psychological constructs.

Convergent and Criterion Validity

The scale demonstrates strong convergent validity with established measures of source credibility (McCroskey, 1966), homophily (McCroskey, Richmond, & Daly, 1975), and nonverbal immediacy (Andersen, 1979). Specifically, the Task Attraction subscale demonstrates high, statistically significant correlations with source credibility dimensions of Competence (r > .60) and Composure, while the Social Attraction subscale correlates robustly with Goodwill and Attitude Homophily (r > .55). Physical Attraction correlates strongly with external independent ratings of facial and body symmetry, grooming, and photographic aesthetic ratings.

Predictive and Ecological Validity

Criterion-related validity has been demonstrated across diverse behavioral outcome studies. In organizational settings, task attraction scores predict willingness to select partners for joint assignments, team conflict levels, and productivity ratings. In instructional communication contexts, teacher task and social attraction scores strongly predict student affective learning, cognitive recall, and attendance behaviors. In media studies, physical and social attraction scores reliably predict the development of parasocial relationships, viewer loyalty, and consumer intent following celebrity endorsements.

8. Reliability

The reliability of the Interpersonal Attraction Scale has been documented across hundreds of published studies, consistently meeting and exceeding standard psychometric criteria for both research and diagnostic applications:

Internal Consistency

In McCroskey and McCain’s (1974) foundational publication, the internal consistency of the subscales, computed via split-half reliability and Cronbach’s alpha coefficients, demonstrated exceptional stability:

• Social Attraction: Alpha coefficients typically range from .75 to .84.
• Physical Attraction: Alpha coefficients typically range from .80 to .89.
• Task Attraction: Alpha coefficients typically range from .86 to .92.

Later psychometric revisions and cross-cultural adaptations (e.g., McCroskey, McCroskey, & Richmond, 2006) report overall composite reliability coefficients frequently exceeding .85 across all three dimensions, confirming robust item-total correlations across diverse sampling demographics.

Test-Retest Stability

Test-retest reliability evaluations across two- to four-week intervals among stable acquaintance dyads have yielded temporal stability coefficients between r = .78 and r = .86, demonstrating that perceived interpersonal attraction remains stable in the absence of significant relational turning points or behavioral violations. When dyadic relational violations (e.g., broken trust, nonverbal coldness) are experimentally introduced, the subscale scores exhibit sensitive and statistically significant shifts, evidencing both temporal stability and appropriate responsiveness to contextual changes.

9. Factor Analysis

The underlying dimensionality of the Interpersonal Attraction Scale was established using rigorous exploratory and confirmatory factor analytic procedures:

Exploratory Factor Analysis (EFA)

In the original 1972 and 1974 investigations, McCroskey and McCain submitted an initial pool of 30 items to principal components factor analysis (PCA) followed by both orthogonal (Varimax) and oblique (Promax) rotations. Criteria for item retention included:

• A primary factor loading of .60 or higher on the hypothesized latent factor.
• No cross-loading greater than .40 on any secondary factor.
• A minimum eigenvalue cutoff of 1.0 (Kaiser criterion), accompanied by scree plot inspection.

The analysis yielded a clean three-factor structure accounting for over 52% of the total variance in the unconstrained 30-item pool. The cleanest items were subsequently refined into the classic 18-item scale (6 items per factor) and the 15-item short form (5 items per factor).

Confirmatory Factor Analysis (CFA) and Model Fit

Subsequent psychometric evaluations utilizing modern structural equation modeling (SEM) paradigms (e.g., McCroskey et al., 2006) have subjected the three-factor model to rigorous confirmatory testing against competing models (such as a unidimensional single-factor model and a two-factor socio-emotional vs. task model). The three-factor oblique model consistently demonstrates superior fit:

• Chi-Square / Degrees of Freedom (χ²/df): Typically < 2.5
• Comparative Fit Index (CFI): Ranging from .93 to .97
• Tucker-Lewis Index (TLI): Ranging from .92 to .96
• Root Mean Square Error of Approximation (RMSEA): .048 to .065 (with 90% confidence intervals confirming excellent fit)
• Standardized Root Mean Square Residual (SRMR): < .055

Standardized item factor loadings in CFA models routinely fall between .62 and .88, confirming strong construct saturation across all three dimensions.

10. Instrument / Measurement Tool

The structural, administrative, and operational characteristics of the Interpersonal Attraction Scale are detailed below:

• Instrument Name: Measures of Interpersonal Attraction (Old versions / IAS)
• Authors: James C. McCroskey and Thomas A. McCain (1974)
• Instrument Type: Self-report psychometric questionnaire; multidimensional interpersonal rating scale
• Target Population: Adults, college students, adolescents, coworkers, classroom peers, and research participants evaluating any designated target individual (e.g., acquaintance, leader, coworker, teacher, media personality)
• Administration Format: Paper-and-pencil or computer-assisted self-administered survey
• Administration Time: Approximately 3 to 5 minutes for the 15- or 18-item versions; 6 to 8 minutes for the full 30-item pool
• Item Formats and Inventory Variants:
  • 30-Item Exploratory Pool: The original developmental battery encompassing 10 Social, 10 Physical, and 10 Task items.
  • 18-Item Standard Version: 6 items per dimension (Social: items 1–6; Physical: items 7–12; Task: items 13–18).
  • 15-Item Refined Form: 5 items per dimension, optimized for minimal cross-loadings.
• Response Scales:
  • 7-Point Format: 7 = Strongly Agree, 6 = Moderately Agree, 5 = Slightly Agree, 4 = Undecided, 3 = Slightly Disagree, 2 = Moderately Disagree, 1 = Strongly Disagree.
  • 5-Point Format: 1 = Strongly Disagree, 2 = Disagree, 3 = Neutral, 4 = Agree, 5 = Strongly Agree.
• Scoring Instructions:
  • Reverse-coded items must be inverted prior to aggregation (e.g., on a 7-point scale: 7 becomes 1, 6 becomes 2, 5 becomes 3, 4 remains 4, 3 becomes 5, 2 becomes 6, 1 becomes 7; on a 5-point scale: 1 becomes 5, 2 becomes 4, 3 remains 3, 4 becomes 2, 5 becomes 1).
  • In the 18-item version, reverse-coded items are: 3, 4, 5 (Social); 8, 11, 12 (Physical); 13, 17, 18 (Task).
  • In the 15-item version, reverse-coded items are: 2, 3, 4 (Social); 9, 10 (Physical); 11, 14, 15 (Task).
  • Subscale scores are derived by calculating the sum or mean of the items within each specific dimension.
  • Crucial Scoring Rule: Do not compute a total composite score across all dimensions. As emphasized by the authors, adding social, physical, and task attraction together is conceptually invalid (“similar to the proverbial adding of apples, oranges, and watermelons”). Each dimension must be evaluated and reported independently.

11. Permissions & Fee and Test Year

The Interpersonal Attraction Scale was originally introduced at the Annual Convention of the Western Speech Communication Association in 1972 and formally published in Speech Monographs in 1974. Dr. James C. McCroskey maintained an open-access philosophy regarding educational and academic measurement tools. The scale is in the public domain for non-commercial scholarly, research, and educational purposes.

No licensing fees or formal written permissions are required for academic scholars, university faculty, or graduate students utilizing the scale for non-commercial scientific research, classroom instruction, or institutional assessment, provided that appropriate bibliographic citation is accorded to the original publications (McCroskey & McCain, 1974; McCroskey, McCroskey, & Richmond, 2006). Commercial applications, incorporation into proprietary digital assessment software, or fee-for-service consulting packages require permission from the copyright holders or designated institutional representatives.

12. References

The following foundational publications document the creation, validation, and psychometric evolution of the Interpersonal Attraction Scale:

• Andersen, J. F. (1979). Teacher immediacy as a predictor of teaching effectiveness. Communication Education, 28(1), 543–559. https://doi.org/10.1080/03634527909378332
• Asch, S. E. (1946). Forming impressions of personality. The Journal of Abnormal and Social Psychology, 41(3), 258–290. https://doi.org/10.1037/h0055756
• Byrne, D. (1971). The Attraction Paradigm. Academic Press.
• Dion, K., Berscheid, E., & Walster, E. (1972). What is beautiful is good. Journal of Personality and Social Psychology, 24(3), 285–290. https://doi.org/10.1037/h0033731
• Homans, G. C. (1958). Social behavior as exchange. American Journal of Sociology, 63(6), 597–606. https://doi.org/10.1086/222355
• McCroskey, J. C. (1966). Scales for the measurement of ethnocentrism. Speech Monographs, 33(1), 65–72. https://doi.org/10.1080/03637756609375482
• McCroskey, J. C., & McCain, T. A. (1972). The measurement of interpersonal attraction. Paper presented at the Annual Convention of the Western Speech Communication Association, Honolulu, HI, November 1972.
• McCroskey, J. C., & McCain, T. A. (1974). The measurement of interpersonal attraction. Speech Monographs, 41(3), 261–266. https://doi.org/10.1080/03637757409375845
• McCroskey, J. C., Richmond, V. P., & Daly, J. A. (1975). The development of a measure of perceived homophily in interpersonal communication. Human Communication Research, 1(4), 323–332. https://doi.org/10.1111/j.1468-2958.1975.tb00281.x
• McCroskey, L. L., McCroskey, J. C., & Richmond, V. P. (2006). Analysis and improvement of the measurement of interpersonal attraction and homophily. Communication Quarterly, 54(1), 1–31. https://doi.org/10.1080/01463370500270322
• Thibaut, J. W., & Kelley, H. H. (1959). The Social Psychology of Groups. John Wiley & Sons.

13. Items of the Scale