The major problem with observational methods is that the investigator has little control over the situation he is interested to observe. In the natural setting, too many extraneous factors influence the phenomenon. As a result, it is difficult to assess what causes or determines the behaviors of researcher's interest. It is extremely difficult, and sometimes impossible to establish cause-and-effect relationships in our understanding of the behaviors. The observational report in most cases turns out to be descriptions of events rather than explanations for the event that can be used for prediction and control.