Ø They permit measurement of
actual behavior rather than reports of intended or preferred
behavior.
Ø There is no reporting bias,
and potential bias caused by the interviewer and the interviewing
process is eliminated or reduced.
Ø Certain types of data can be
collected only by observation.
Ø If the observed phenomenon occurs
frequently or is of short duration, observational methods may be cheaper
and faster than survey methods.
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any suggestion on my side