This book is about how to mix methods in quantitative and qualitative researches correctly. The aim is to help researchers to use the mixed methods correctly. The contents of the book include: Definition and Rules for Mixing Quantitative and Qualitative MethodsStrengths and Weaknesses of Research that Uses Mixed MethodThe Basic Differences of Quantitative and Qualitative ApproachParadigm of Mixed MethodsMixed Method DesignsSampling Techniques for Mixed Method ResearchesProblems for Research Using Mixed MethodsRisks and Opportunities in Mixed MethodStrategy Minimizing Errors in Mixed MethodsData Collection ProceduresData AnalysisReport PresentationValidity and Reliability in Mixed Method Research