Answer:
Ans. Major advantage of observation is that it allows behaviour to be seen & studied in its natural setting. People from outside or those already working in a setting can be trained to use it. One disadvantage of observation is that events being observed are subject of bids due to the feelings of the people involved as well as of the observers. Generally day-to-day activities in a given setting are fairly routine which can go unnoticed by the observer. Mere presence of the observer may contaminate the results/observations.
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