Systematic reviews incorporating mixed-methods research are crucial for unraveling complex research questions in recent years. This paper introduces the MMAT (MIXED METHODS APPRAISAL TOOL), which is quality assessment tool for quantitative, qualitative, and mixed-methods research. Its development process, usage, and evaluation criteria, and present a review article that actually used MMAT to assess research methodology quality, are explained. Finally, in a Café Talk session, the unique characteristics of nursing research, MMAT's strengths and limitations, and future prospects for the Methods Café, are discussed.