I used this book as the backbone to explain the theoretical framework of my doctoral research experimental design. It is comprehensive, well-written, and, as of the end of 2017, up-to-date. Although I used many sources (book and journal articles), this book was the most important to explain why I did what I did and why. This book could be used to teach a course on mixed-methods design or as a reference book, as I used it, to explore options before choosing the most appropriate method for your research questions, context, and resources.