Dr. Udo Kuckartz is a Professor Emeritus of Methods of Social Research in Education at the Philipps-Universität Marburg, Germany. His research focuses on qualitative and quantitative methods, mixed methods and visualization of social science research data. He has published more than twenty textbooks in German, English, Chinese, and Japanese. Dr. Stefan Rädiker is a research methods and evaluation consultant and trainer. His research focuses on the computer-assisted analysis of qualitative and mixed methods data using MAXQDA software. He has published more than six textbooks in German and Chinese.