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Article Critique Part 3 1.)Internal validity refers to how well the experiment is done and avoids having the option of having more than one independent variable acting at the same time. Having a high internal validity allows the individual to pick that explanation with confidence. External validity refers to how well results can be generalized outside of the constraints of an experiment, in different settings with different people. 2.)Threats to internal validity include: history (events that occur during the experiment), maturation (change in behavior due to passage of time), testing (likelihood that the repeated assessment task will result in participant behavior change), instrumentation (concerns with the measurement system), procedural infidelity (lack of adherence to condition protocols by study implementers), and selection bias. Threats to external validity include: a multiple treatment interference such as instability (the amount of