Distinctive in its emphasis on research as a natural corollary to practice, this book takes readers step-by-step through the process of developing a practical agenda for such projects, explaining clearly how to formulate questions and hypotheses, conduct group and single-system naturalistic and experimental designs, analyze and compile data, and write research reports. New to the third edition are a complete glossary of terms, additional diagrams, new examples from real-life studies focusing on cultural diversity and oppression, and increased emphasis on themes relevant to practice.