Abstract
Summary: The purpose of this study was to develop a self-report questionnaire for the assessment of social anxiety in adults. The Inventory of Interpersonal Situations (IIS) consists of 35 items formulated as responses to specific social situations. The IIS is based on an interactive concept of social anxiety and provides scores for both a Discomfort and a Frequency scale. The reliability and validity of the IIS were investigated in several adult psychiatric and nonpsychiatric samples. The scales for Discomfort and Frequency showed stability over time. Cronbach's α's revealed a sufficiently high internal consistency on both scales, while the conceptual structure was shown to be rather invariant across socially anxious and nonsocially anxious groups. The IIS scales were able to discriminate between socially anxious and nonsocially anxious samples, and showed significant relationships with independent measures of social anxiety. The IIS scales demonstrated high predictive validity for overt behavior in social situations.
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