How do you plan a TESOL research project? How do you analyse research data qualitatively and quantitatively? How should you report your results? Covering the basics of language research methodology, this textbook shows you how to effectively choose and combine quantitative and qualitative methods in your own research and in assessing others'. Divided into three main sections, the book provides a comprehensive but practical overview of the different phases and activities involved in developing and implementing sound, rational, and effective mixed methods research, taking into account the intercultural implications. Each chapter illustrates the core principles in practice, using case studies of English teaching research worldwide. Chapters cover the following topics in relation to mixed methods research: the qualitative/quantitative continuum, planning a project, gathering data, analyzing data, interpreting results, reporting, as well as research in classrooms, action research, corpus research, statistical research, conversation and discourse analyses, survey research, testing research, and program evaluation. Each chapter recommends applications in ESL and EFL classes and programs and offers guided tasks, presenting extracts and summaries of MMR studies from the TESOL literature, and suggests further readings to inform individual practice. Examples from international settings are used to explain eight different research traditions and how mixed methods research has been applied to them. Concepts are explained step-by-step providing an accessible resource to students, language teachers, and researchers in a variety of cultures. James Dean ("JD") Brown is Professor of Second Language Studies at the University of Hawai'i at Mānoa