This essay provides a comprehensive overview of mixed methods research, defining it as a research design that integrates both philosophical assumptions and methodologies. It emphasizes the collection, analysis, and mixing of quantitative and qualitative data to offer a more complete understanding of research problems than either approach alone. The essay discusses the advantages of mixed methods research, such as compensating for the weaknesses of individual methods, providing more thorough evidence, and addressing research questions unanswerable by single methodologies. It also explores the ways data can be mixed, including combining, connecting, or embedding datasets. Finally, the essay addresses current issues in mixed methods research, such as the stages of mixing, effective methods for integration, and the philosophical positions best suited to support this approach. It concludes by highlighting the value of mixed methods as a powerful third worldview in research.