With the addition of new co-author Linda Brannon, Lefton now means "Active Learning" in a brand-new way. This new edition of Psychology has undergone a major revision with thousands of new references and dozens of new topics added. New co-author Linda Brannon has worked closely with Lester Lefton to rewrite, reorganize, and provide a stronger focus on gender and diversity issues, as well as a new emphasis on the process of research. Four major themes are recurrent in the text: the integration of diversity, the importance of biological/evolutionary topics, the complex relationship between nature and nurture, and the importance of students' ability to apply and critique basic psychological principles within their own lives. The pedagogical plan reinforces the need for students to be active in their own learning process. Students are encouraged to review what they have learned, apply what they have learned to the world around them, and reflect on the connections between topics.