1. Reactivity

    Reactivity is the tendency of people to act or appear differently when they know that they are being observed. In the 1920s, Hawthorne Works (a manufacturing facility) commissioned a study to see if different levels of light influenced worker productivity. What they found was incredible, changing the light caused productivity to soar! Unfortunately, when the study was finished, productivity levels decreased to their regular levels. This was because the change in productivity was not due to the light levels, but to the workers being watched. This demonstrated a form of reactivity; when individuals know they are being watched, they are motivated to change their behavior, generally to make themselves look better. Reactivity is a serious problem in research, and has to be controlled in blind experiments (“Blind” is when individuals involved in a research study are purposely withheld information so as not to influence the outcomes). Source

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      Like when teachers are walking around during a test and they stop right next to you to watch you write down an answer or...
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      makes sense.
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