Over the past 15 years, courts have begun implementing a host of reforms to the jury system in response to growing criticism about jurors' competence to decide cases. Of particular concern was the ability of jurors to set aside preexisting biases and to understand increasingly complex evidence and legal principles. This entry describes the efforts undertaken by the courts to address these concerns. In particular, the section on voir dire focuses on efforts to elicit complete and candid information from prospective jurors during jury selection while balancing competing interests in courtroom efficiency and juror privacy. The second section focuses on the techniques employed by judges and lawyers during trial to enhance juror comprehension and performance.