This document discusses research methods and classification. It defines research as systematic work undertaken to increase knowledge through observation and experimentation. Research can be empirical, systematic, controlled, employ hypotheses, and use quantitative or qualitative methods. The main purposes of research are to inform action, prove theories, and contribute to developing knowledge. Common research methods include observation, surveys, interviews, focus groups, experiments, secondary data analysis, and mixed methods. Research methodology refers to the general strategy and systematic collection and analysis of data related to the field of education.