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