The good litigator has always been a good amateur psychologist. He or she must be able to judge which people will be good jurors, how a witness will impress a jury, the kinds of questions that are most likely to elicit desired answers, ways in which people attribute responsibility, and weaknesses in opposing testimony. In recent years the psychological literature has been replete with studies that bear on these and other matters that are important to the trial attorney and to those concerned with the structure of our trial justice system. It is now possible to educate our intuitions. This course will focus on those psychological studies that are most relevant to trial lawyers. It will deal with such things as systematic (or scientific) methods of jury selection, the problems of eyewitness identification, the influence of different jury instructions, the effects of speech style on witness credibility, the influence of questions on answers, and the likely effects of different decision rules (e.g., judge vs. jury, unanimous verdict vs. non unanimous verdict).