This document discusses research design and methodology in health research. It defines research and health research, and explains that health research involves systematically collecting, analyzing, and interpreting data to answer questions and solve problems in order to improve health. The document discusses how research involves turning information into knowledge through critical assessment. It also explains the importance of health research for informing health policy decisions. The document outlines the research process and emphasizes the importance of ethics in research, discussing principles like beneficence, non-maleficence, respect, and justice when working with human subjects. It also discusses several important codes and declarations that guide ethical research practices.