1. There are questions about the external validity of the AS diagnosis. 2. Neither internal nor external validity are captured in a single experiment. 3. When external validity is low, the credibility of your research comes into doubt. 4. Depending on the goals of the experiment, this may diminish its external validity . 5. The apparent contradiction of internal validity and external validity is, however, only superficial. 6. Usually Quasi-experiments are chosen by experimenters because they maximize internal and external validity . 7. Other factors jeopardizing external validity are: 8. In particular, a hotly contested issue with regards to field experiments is their external validity . 9. Some researchers believe that a good way to increase external validity is by conducting field experiments. 10. Through replication, researchers can study a given research question with maximal internal and external validity .
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