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First, the field-worker can observe only a small sample of behavior, which may not be typical. Second, fieldwork tends to depend more on the observer’s intuitions and therefore to be more subjective than other methods. Third, it is difficult to generalize from or to replicate a field study. Fourth, if the researchers make their presence known, their presence may alter the behavior. And if they are participant observers, who join the activities they study, there is always a danger that they may become overinvolved with the subjects and become more of a friend than an impartial investigator.