Sociology tries to find out the general laws or principles about human interactions and association, about the nature, form, content and structure of human groups and societies. It does not study each and every event that takes place in society. It is not possible also. It tries to make generalisation on the basis of the study of some select events. For example, a sociologists makes generalisations about the nature of secondary groups. He may conclude that secondary groups are comparatively bigger in size, less stable, not necessarily spatially limited, more specialised, and so on. This, he does, not by examining all the secondary groups but by observing and studying few.