Previous studies have used cross-sectional designs to demonstrate the beneficial effect of acquaintanceship on the validity of personality impressions. To counter critiques of those studies, a longitudinal design was used. Participants were randomly assigned to 16 groups of 5-7 members who met once a week for 7 weeks. None of the participants in any group were previously acquainted. Before the first meeting, they completed a battery of self-report measures, including the NEO Five Factor Inventory and the revised Interpersonal Adjective Scales
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Paulhus et al. (1992) studied this question.
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