To determine the criterion related validity of the Personal Report of Communication Apprehension (PRCA), 156 college students enrolled in a beginning public speaking course were administered the PRCA and asked to evaluate peers' speeches using a standard evaluation form. Offering support for the PRCA's validity, results showed a correlation between communication apprehensives' self-reports and peer evaluations. Student evaluators perceived people reporting high levels of communication apprehension as speaking too softly, providing long pauses for no apparent reason, having a shaking voice, apologizing for their message, not responding to their audience, blushing, and having trembling hands. They also evaluated high communication apprehensives more negatively than their peers, seeing them as less credible, less attractive, less likely to influence opinions, and less effective in communication. Behaviors reported by peers fell into three sets of behaviors, indicating either tension, lack of assertion, or excessive concern with self. (MM)