In the revised Fourth Edition of the best-selling text, John W. Creswell and new co-author Cheryl N. Poth explore the philosophical underpinnings, history, and key elements of five qualitative inquiry approaches: narrative research, phenomenology, grounded theory, ethnography, and case study. Preserving Creswell's signature writing style, the authors compare the approaches and relate research designs to each of the traditions of inquiry in a highly accessible manner. Featuring new content, articles, pedagogy, references, and expanded coverage of ethics throughout, the Fourth Edition is an ideal introduction to the theories, strategies, and practices of qualitative inquiry.