The classical experimental design,which serves as a prototype for our discussion of all other research designs,contains three elements;equivalence,pre-tests and post-tests,and experimental and control groups.

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The classical experimental design indeed includes three key elements: equivalence (achieved through random assignment to ensure that experimental and control groups are comparable), pre-tests and post-tests (to measure changes that occur as a result of the intervention), and the use of experimental and control groups (to compare outcomes between those receiving the intervention and those who do not).

The Classical Experimental Design,which Serves as a Prototype for Our