Originally published in 1940, remains a classic. The broadcast provided a unique real-life opportunity to explore why the relatively new medium of radio could have such an effect. Using a mix of research methods, Cantril shows that the impact of the broadcast had less to do with what went out over the air than with the "standards of judgment" people did or did not use in evaluating what they were hearing. This book is of continuing value to those interested in communications and mass behavior.