Interaction Anxiousness Scale

Abstract

The Interaction Anxiousness Scale (IAS) is a concise, 15-item psychological scale designed to measure chronic and generalized anxiety experienced specifically within social and interpersonal interactions. Developed by Mark R. Leary and Robin M. Kowalski, the IAS utilizes a self-report format to assess the degree to which an individual consistently feels nervous, tense, or uncomfortable across a wide range of common social settings, from informal gatherings to structured interactions with figures of authority. It functions as a robust measure of dispositional social anxiousness, effectively distinguishing this anxiety-based trait from related concepts such as introversion or deficits in social skills.

The scale captures the internal, subjective distress associated with anticipating or engaging in social performance. Its strong psychometric properties, including high internal consistency and clear unidimensional factor structure, have established the IAS as a widely utilized research tool in the fields of personality and social anxiety assessment.

Keywords

Interaction Anxiousness Scale, IAS, social anxiety, shyness, personality assessment, dispositional anxiety, psychometrics, self-report scale, Mark R. Leary, Robin M. Kowalski.

Authors

Mark R. Leary, Robin M. Kowalski

Purpose

The primary purpose of the Interaction Anxiousness Scale is to reliably quantify stable individual differences in the tendency to experience anxiety in various social and interpersonal contexts. It was created to provide researchers and clinicians with an efficient instrument capable of assessing the subjective distress that accompanies social engagement, moving beyond mere behavioral avoidance measures.

The IAS is critical for capturing the cognitive and emotional components of social anxiousness, focusing specifically on the discomfort experienced during actual or anticipated social performance. By targeting the anxious component of social interaction, the scale facilitates research into the antecedents, correlates, and long-term consequences of this specific form of trait anxiety, aiding in the differentiation between clinical social distress and simple reservation or introversion.

Construct

The IAS measures the construct of Interaction Anxiousness, defined as a chronic, generalized state of apprehension, tension, and nervousness experienced across diverse social situations. While closely related to general social anxiety and shyness, the IAS emphasizes the internal, emotional response (anxiety and discomfort) rather than solely focusing on external manifestations like behavioral withdrawal or inhibition.

The theoretical foundation of interaction anxiousness, as proposed by Leary and Kowalski, is fundamentally linked to the individual’s pervasive concern regarding how they are being judged by others—a concept known as the Fear of Negative Evaluation (FNE). Consequently, individuals scoring high on the IAS report a generalized lack of confidence and pervasive tension spanning multiple social domains, including speaking to strangers, interacting with attractive peers, or conversing with authority figures.

Validity

The Interaction Anxiousness Scale has consistently demonstrated strong evidence of both construct validity and criterion-related validity across numerous empirical investigations, confirming its ability to measure the intended trait and predict related behaviors. Leary and Kowalski’s foundational 1993 validation paper established the scale’s predictive power regarding emotional states and behaviors theoretically linked to social anxiety.

• Convergent Validity: The IAS exhibits high positive correlations with other established measures of related constructs, including social anxiety, trait anxiety, and shyness scales (e.g., the Revised Cheek and Buss Shyness Scale and the Fear of Negative Evaluation Scale), confirming that it measures similar underlying dimensions.
• Discriminant Validity: The scale shows appropriately low correlations with theoretically distinct constructs, such as general intelligence, measures of non-social personality traits, or measures of social skills ability, ensuring that it is not merely redundant with other psychological instruments.
• Criterion-Related Validity: High scorers on the IAS typically demonstrate greater subjective discomfort, display more overt anxious nonverbal behaviors, and exhibit reduced performance effectiveness during structured, laboratory-based social tasks when compared to low scorers, confirming its predictive utility in real-world or simulated social performance settings.

Reliability

The Interaction Anxiousness Scale demonstrates robust levels of internal consistency and temporal stability, confirming its dependability as a measurement instrument for research and clinical assessment. The scale’s 15 items reliably cohere, indicating they measure the same underlying construct.

• Internal Consistency: Studies consistently report excellent estimates of internal consistency. Measures of Cronbach’s alpha typically range from 0.88 to 0.94, suggesting high homogeneity among the scale items and confirming that the scale is highly reliable across different samples.
• Test-Retest Reliability: The IAS exhibits strong temporal stability. High correlation coefficients are consistently reported for scores obtained weeks or months apart, reinforcing the interpretation that Interaction Anxiousness represents a stable, enduring personality trait rather than a temporary state.

Factor Analysis

Factor analytical investigations of the IAS overwhelmingly support its conceptualization as a unidimensional scale. Although the items address anxiety across various specific interaction domains (e.g., interactions with authority figures, strangers, or the opposite sex), these individual facets converge strongly onto a single underlying factor.

This strong unidimensional structure indicates that the scale primarily measures a global trait of generalized social anxiousness, suggesting that anxiety experienced in one social setting is highly correlated with anxiety experienced in others. This finding supports the use of a single total score for the IAS in research contexts.

Instrument

Test Type: Self-report questionnaire / Personality assessment scale

Format: 15 items rated on a 5-point Likert scale

Language Available: Primarily English, with validated translations utilized in numerous international psychological studies.

Population Group: General population, frequently employed in non-clinical college student samples and in clinical populations focused on anxiety disorders.

Age Group: Adolescents and Adults (typically 16 years and older)

Population Details: The scale is specifically designed to assess trait-level anxiety, making it suitable for both non-clinical research and initial screening within clinical settings interested in pervasive social anxiety.

Test Methodology: Respondents are instructed to indicate the degree to which each statement is characteristic of them using the provided 5-point rating scale, reflecting their typical feelings and behaviors.

Keywords

Self-report, Likert scale, personality trait, social interaction, assessment, psychometrics, anxiety measure, research instrument, dispositional measure.

Authors

Author ORCID Identifier: Not publicly provided for standard academic entry.

Affiliation Email addresses: Not publicly provided for standard academic entry.

Correspondence Address: Correspondence regarding the scale and permissions is typically directed through the authors’ affiliated university psychology departments (e.g., Duke University for Mark R. Leary).

Permissions & Fee and Test Year

The Interaction Anxiousness Scale is generally considered available for non-commercial academic research use without licensing fees. The construct of social anxiousness was initially defined and measured in 1983, and the definitive 15-item IAS was formally introduced and validated in 1993. The instrument can often be accessed directly from academic sources. The original distribution source cited is: http://people.duke.edu/ch‎arleary/scales.html

Reference’s

• Leary, Mark R. (1983). Social Anxiousness: The Construct and Its Measurement. Journal of Personality Assessment, 47: 66-75.

• Leary, Mark R., & Kowalski, Robin M. (1993). The Interaction Anxiousness Scale: Construct and Criterion-Related Validity. Journal of Personality Assessment, 61: 136-146.

• Leary, R.M. & Kowalski, N.R. (1995). Social Anxiety. New York: The Guilford Press.

Items of the Interaction Anxiousness Scale

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

1. I often feel nervous even in casual get-togethers.

2. I usually feel comfortable when I’m in a group of people I don’t know.

3. I am usually at ease when speaking to a member of the other sex.

4. I get nervous when I must talk to a teacher or a boss.

5. Parties often make me feel anxious and uncomfortable.

6. I am probably less shy in social interactions than most people.

7. I sometimes feel tense when talking to people of my own sex if I don’t know them very well.

8. I would be nervous if I was being interviewed for a job.

9. I wish I had more confidence in social situations.

10. I seldom feel anxious in social situations.

11. In general‚ I am a shy person.

12. I often feel nervous when talking to an attractive member of the opposite sex.

13. I often feel nervous when calling someone I don’t know very well on the telephone.

14. I get nervous when I speak to someone in a position of authority.

15. I usually feel relaxed around other people‚ even people who are quite different from me.

Response Scale:

• 1 = Not at all characteristic of me.

• 2 = Slightly characteristic of me.

• 3 = Moderately characteristic of me.

• 4 = Very characteristic of me.

• 5 = Extremely characteristic of me.