90 college women heard an E take a rigged phone call in which he advocated an event which was either neutral, unacceptable, or acceptable to the listeners. For ½ the listeners, E took the call in their presence and, for the others, he ran around to his office saying "I can't talk about that here." Dependent variable consisted of opinions on compulsory ROTC, increasing, and decreasing tuition. ... [Show full abstract] Data corroborated Walster and Festinger: overheard communications were especially effective for involved listeners when the advocated position was acceptable. However, overhearing was not more effective for the unacceptable propaganda. Results were ordered to a model in which information receptivity and communicator credibility combine multiplicatively to determine propaganda effectiveness.