----------------are directly observable, concrete representations of hypothetical constructs.

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Operational definitions are concrete and observable representations of abstract concepts or constructs. They provide a clear and objective way of measuring these hypothetical constructs in research. Postulates are basic assumptions or propositions in a theory. Variables refer to characteristics or attributes that can be measured or manipulated in research. Research strategies are the overall plans or approaches used to conduct research.

----------------Are Directly Observable, Concrete Representations of Hypothetical Constructs