Final answer:
External validity is concerned with the generalization of research findings to broader contexts, including different people, places, and times, as opposed to internal validity, which focuses on study design rigor, or construct and face validity, which are about how well a test measures a concept and the superficial appearance of validity, respectively.
Step-by-step explanation:
The type of validity that is most concerned with whether results can be generalized to other persons, places, and times is known as external validity. This form of validity is crucial for understanding how study findings can be applied in settings outside the original context of the research. If a study has high external validity, its conclusions are thought to hold true beyond the specific conditions under which the study was conducted. This differentiates it from internal validity, which is concerned with the rigor of the study design and whether the results are due to the variables being tested rather than extraneous factors. Construct validity deals with how well a test or measure reflects the concept that it's intended to assess, while face validity pertains to the superficial appearance of validity.