Research design is the plan that provides the logical structure that guides the investigator to address research problems and answer research questions. It is one of the most important components of research methodology. Research methodology not only details the type of research design to be implemented but includes [Page 1253]the approach to measuring variables and collecting data from participants, devising a strategy to sample participants (units) to be studied, and planning how the data will be analyzed. These methodological decisions are informed and guided by the type of research design selected. There are two broad categories of research design: observational and interventional. Each research design emphasizes a different type of relationship to be explored between variables. The social issue or problem that needs further exploration ...
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