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Queries run slower because of the joins. It is necessary to assign relationships to interact with different tables. Data will lose when dinormalising. Some disadvantages of normalization are that it creates an average, it is not precise, and takes away from the true results. This is helpful when determining overall results across many samples.
While naturalistic observation can be useful in many cases, this method also has some potential downsides that must be considered. One of the disadvantages of naturalistic observation includes the fact that it can be difficult to determine the exact cause of a behavior and the experimenter cannot control for outside variables. Some other disadvantages of naturalistic observation: 1  People may behave differently when they know they are being watched. 2  People may try to behave in a certain way in order to conform with what they think the researchers expects to see.