The document discusses research design. It defines research design as a plan for collecting and analyzing data to answer research questions or test hypotheses. A good research design specifies the methods and procedures for collection and analysis of needed information. Key components of research design include the population, sample, data collection tools and methods, timing of data collection, and approach (qualitative, quantitative, or mixed methods). The selection of a research design depends on factors like the research problem, available resources, and ethics. Research designs can be experimental, quasi-experimental, non-experimental, or mixed methods. The document provides examples of different research designs and discusses their advantages and disadvantages.