experimental validity external validity http://en.wikipedia.org/wiki/Validity_(statistics) Yongqun He An experimental validity that refers to the extent to which the (internally valid) results of a study can be held to be true for other cases, for example to different people, places or times. In other words, it is about whether findings can be validly generalized. If the same research study was conducted in those other cases, would it get the same results?