Research methodologies to understand the product development process Research methodology is central to the rigour and quality of research. This chapter presents the research methodologies that are used to understand the product design and development process and accordingly the research methodology adopted in this book. After a description of the three major relevant research methodologies used to understand the product development process, the particular research methodologies are presented. Next, other classifications of research methodologies to understand the product development process are described, followed by collected data types. Next, sampling and statistical errors are considered. Data collection methods, research validity methods and research verification methods are then considered. Finally, the chapter presents the adopted research methodology.