Hawthorne effect - When people behave differently if they know they are being watched., methodological pluralism - The use of a variety of methods in a single piece of research, Triangulation - The use of two or more research methods in a single piece of research to check the reliability and validity of research evidence., Sample - A smaller representative group drawn from the survey population for studying, Sampling frame - A list of names of all those in the survey population from which a representative sample is selected.,

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