The document discusses foundational concepts in research including ontology, epistemology, methods, methodology, research design, and research strategy. It then outlines four main research strategies: inductive, deductive, retroductive, and abductive. The inductive strategy builds theories from observations. The deductive strategy tests hypotheses derived from theories. The retroductive strategy seeks to discover underlying mechanisms to explain observations. The abductive strategy aims to understand social phenomena through the interpretations of social actors.