Identify two threats to external validity providing specific example for each threat and providing the rationale as to how your example could provide a threat to external validity.

Identify two threats to external validity providing specific example for each threat and providing the rationale as to how your example could provide a threat to external validity.

Reading Resources
Andrade, C. (2018). Internal, external, and ecological validity in research design, conduct and evaluation. Indian Journal of Psychological Medicine, 40(5), 498 – 499.

Prohaska, T.R.& Etkin, Caryn, D. (2010). External validity and translation from research to implementation. Journal of the American Society on Aging. 34(1), 59 – 65.

Ruane, J. M. (2016). Introducing social research methods: Essentials for getting the edge. Chapter 6

Shean, G.D. (2012). Some limitations on the external validity of psychotherapy efficacy studies and suggestions for further research. American Journal of Psychotherapy, 66(3), 227 – 242.

Engel, J. E., & Schutt, R.K. (2017). The practice of research in social work, (4th ed.). Sage.

Rossi, P. H., Lipsey, M. W., & Freeman, H.E. (2004). Evaluation: A systematic approach, (7th ed.). Sage

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