When global policy makers and service providers introduce new interventions, we expect the products to be evaluated by academic researchers. The gold standard for measuring the effectiveness of an intervention is the randomised controlled trial (RCT). The participants in a RCT are randomly allocated to receive either the new intervention or a placebo. Historically, RCTs have been conducted to estimate the effectiveness of drugs. Today the trials have become an invaluable research method used across multiple disciplines. Currently, academics are introducing qualitative research with RCTs. The methodology of qualitative research is in many ways the opposite of a RCT, as it emphasises subjectivity rather than objectivity, and flexibility over standardisation. A Practical Guide to using Qualitative Research with Randomized Controlled Trials is a "how-to" manual on combining these contrasting methodologies to get the best result. Guiding the reader through the use of qualitative research in RCTs, this text illustrates how to prepare for, undertake, and implement the results of a RCT in new ways. Divided into three parts, this book covers the process of using qualitative research with RCTs from start to finish. Section one outlines how to introduce qualitative research in the context of RCTs, section two provides practical guidance for using qualitative research with RCTs, and the final section guides the reader on how to engage with relevant stakeholders. Each chapter focuses on the key steps of undertaking qualitative research in RCTs, giving examples of how to write a proposal, select research questions, integrate qualitative and quantitative components, and much more. A Practical Guide to using Qualitative Research with Randomized Controlled Trials is ideal for researchers who are leading, undertaking, or planning to undertake qualitative research with RCTs. With its detailed explanations and inspiring examples, this book is also a one of a kind tool for postgraduate students wishing to conduct their own RCT using qualitative research.