Threats to construct validity
Threats to statistical conclusion validity
Threats to internal validity
Threats to external validity
Although it is claimed that the measured variables and the experimental
manipulations relate to the conceptual variables of interests, they actually may not.
Conclusions regarding the research may be incorrect because a Type 1 or Type 2
error was made.
Although it is claimed that the independent variable caused change in the
dependent variable, the changes in the dependent variable may have actually
been caused by a confounding variable.
Although it is claimed that the results are more general, the observed effects may
actually only be found under limited conditions or for specific groups of people.
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