A benefit of most evaluative research is that it is a form of unobtrusive research--the subjects in the study do not know they are being observed can't effect what they have already done.
An exception to this the before-and-after study. When conducting a before-and-after study, be aware of the Hawthorne effect, also called the placebo effect.
Tn the 1930s, researchers at Hawthorne Works, an electric power company near chicago, were trying to find out how the intensity of lighting affected factory workers. The researchers increased the lighting and productivity increased, then slowly settled back to the earlier level. Then they decreased the lighting and productivity increased again. At first, the researchers believed the changes were the result of teamwork among the employees. Similar studies manipulated other aspects of the work environment:pay incentives,shorter hours,longer hours more breaks, fewer breaks. In each case, productivity increase for a short time.
In 1955 Henry Landsberger reanalyzed the older studies.He concluded that the boost in productivity was not caused at all by the amount og lighting but simply because the subjects knew they were being observing and knew that the company was concerned about worker productivity. Landsberger coined the term "Hawthorne effect" which since has been broadened to explain any impact, usually short-term,through which employees are made to feel important or are aware that they are being observed
A benefit of most evaluative research is that it is a form of unobtrusive research--the subjects in the study do not know they are being observed can't effect what they have already done.An exception to this the before-and-after study. When conducting a before-and-after study, be aware of the Hawthorne effect, also called the placebo effect.Tn the 1930s, researchers at Hawthorne Works, an electric power company near chicago, were trying to find out how the intensity of lighting affected factory workers. The researchers increased the lighting and productivity increased, then slowly settled back to the earlier level. Then they decreased the lighting and productivity increased again. At first, the researchers believed the changes were the result of teamwork among the employees. Similar studies manipulated other aspects of the work environment:pay incentives,shorter hours,longer hours more breaks, fewer breaks. In each case, productivity increase for a short time.In 1955 Henry Landsberger reanalyzed the older studies.He concluded that the boost in productivity was not caused at all by the amount og lighting but simply because the subjects knew they were being observing and knew that the company was concerned about worker productivity. Landsberger coined the term "Hawthorne effect" which since has been broadened to explain any impact, usually short-term,through which employees are made to feel important or are aware that they are being observed
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