” A guide to research methodology. This resource is a testament to the collaboration of over fifty luminaries in the field, each contributing their profound expertise to forge a text that is both foundational and forward-thinking. Chapters in the textbooks are grouped in six sections, such as Basics of Research Methodology; Quantitative Research Methodology; Qualitative Research Methodology; Operational Research; Economic Evaluation and Health Technology Assessment; and Systematic Review and Meta-analysis. It is a bridge between theory and practice, between knowledge and application, and between the present challenges and future advancements in health research. This textbook will inspire current and future generations of researchers, providing them with the intellectual toolkit necessary to embark upon their own quests for knowledge and to contribute meaningfully to the ongoing narrative of medical science. “