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Internal validity dictates how an experimental design is structured and encompasses all of the steps of the scientific research method. Even if your results are great, sloppy and inconsistent design will compromise your integrity in the eyes of the scientific community. Internal validity and reliability are at the core of any experimental design. External validity is the process of examining the results and questioning whether there are any other possible causal relationships. Control groups and randomization will lessen external validity problems but no method can be completely successful. This is why the statistical proofs of a hypothesis called significant, not absolute truth. Any scientific research design only puts forward a possible cause for the studied effect.
Produced by Stephanie Tierney â Summer 2008 2. Internal and external validity. An experimental approach is said to be an effective means of strengthening: ï·Internal Validity â This relates to how far a study has established whether. a variable or condition under scrutiny has had an effect.