It is a series of guide posts to keep one going in the right direction.
It reduces wastage of time and cost.
It encourages co-ordination and effective organization.
It is a tentative plan which undergoes modifications, as circumstances demand, when the study progresses, new aspects, new conditions and new relationships come to light and insight into the study deepens.
It has to be geared to the availability of data and the cooperation of the informants.
It has also to be kept within the manageable limits
