Establishing the Internal and External Validity of Experimental Studies Marion K. Slack and Jolaine R. Draugalis Disclosures Am J Health Syst Pharm. 2001;58 (22) Threats to Internal Validity ...

Internal validity relates to the way a test is performed, while external validity examines how well the findings may apply in other settings.

There is an important asymmetry between internal and external validity, which gives insight into the answer to this question. It has to do with how these different kinds of validity are measured.

Eggel, M., Würbel, H. 2021. Internal consistency and compatibility of the 3Rs and 3Vs principles for project evaluation of animal research. Laboratory Animals 55 (3), 233-243. Using animals for ...