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Discussion question: What are the three key aspects of an experimental design? Identify a research project that utilizes comparison group models. Explain how you would determine the validity and reliability to both the design and the methods of your research. Classmate response: The three critical aspects of an experimental design include random assignment, a manipulated IV, and a measure of effect or change (Balkin & Kleist, 2017). When desiring to utilize a research project with comparison group models, the researcher can choose from the quasi-experimental research group, like pretest-posttest control group design (Balkin & Kleist, 2017). As the reliability of a research design and methods are tested by comparing different versions of similar measurements, validity is assessed by comparing the results to relevant theory or data. For example, reliability can be measured with test-retest, interrater, and internal consistency. Validity measuring methods include construct, content, and criterion (Middleton, 2019). Balkin, R., & Kleist, D. (2017). Counseling research: A practitioner-scholar approach. Wiley. ISBN-13: 9781119375425 Middleton, F. (2019). Reliability vs validity in research | differences, types and examples. Scribr. Retrieved from: https://www.scribbr.com/methodology/reliability-vs-validity/#:~:text=Reliability%20can%20be%20estimated%20by,other%20relevant%20data%20or%20theory.