The information needed to determine the internal and external validity of an experimental study is discussed. Internal validity is the degree to which a study establishes the cause-and-effect ...

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

The upshot is that without internal validity, you can’t draw scientific conclusions. But without external validity, you have nothing worth drawing conclusions about.

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) In This Article.