The authors offer proposals for studies of human behavior in the courtroom, with respect to communications interaction among jurors and source credibility of attorneys. They refer to innovations in videotaping procedures, which make it possible to examine communications principles and dynamics in the courtroom situation. The first proposed study will be on the influence of the attorney on the decision-making process of the jury. The authors present an outline of a study that seeks to determine: (1) the dimensions of source credibility of attorneys and how they are affected by their adversary relationships; and (2) the influence of the attorney credibility on the behavior of jurists. The second proposed study deals with analysis of the jury in terms of small group theory and research. They would test their hypothesis that a six-man jury would be superior to the traditional jury of twelve, in terms of maximum efficiency. They also hypothesize that juries' decision-making performances would be improved by instruction in small group behavior and the discussion process. (RN)