Partway through Tape 20, Side 2, to partway through Tape 22, Side 1. In the twelfth interview session, conducted on November 13, 2007, Peterson continues to discuss his service as a justice on the Oregon Supreme Court from 1979 to 1993, and serving as chief justice from 1983 to 1991. He talks about implementing the uniform trial court rules. He also discusses the changes in technology, rules of professionalism, and diversity training. He reads additional entries from his journals detailing this part of his career.