(i) Sociology is called Social Science. Therefore the scientific method of study is very special or important in sociology.
(ii) More than any other subject or discipline related to social science. Sociology deals with things that are already familiar to most people. All of us live in society, and we already know a lot about the subject matter of sociology (several groups, institutions, norms, relationships and so on through our own experience.
(iii) Sociology is called social science and the scholars of this discipline - sociologists are called social scientists. As with all scientific discipline the crucial element here is method or the procedure through which knowledge is gathered. For in the final analysis, sociologists can claim to be different from persons not because of how much they know or what they know, but because of how they acquire their knowledge. This is one reason for the special importance of scientific method in sociology.
(iv) Scholar of sociology are deeply interested in the lined experience of people. For instance when studying social phenomena like friendship or dharm or bargaining in the market, the sociologist wants to know not only what is observable by the bystander, but also the opinion and feelings of people involved for this sociology requires scientific method.
(v) Sociologists make efforts to adopt the point of view of the people in this study to see the use through their eyes. What does friendship mean to people in different cultures? What do religious people do in different cultures? What do religious people think he/she is doing when performing a particular ritual? The Answers to questions are part of the lined experience of actors involved, and they are of great interest to sociology.
(vi) Generally sociologists try to produce knowledge that can claim to be scientific. Science is expected to be objective, to produce unbioas knowledge based solely on facts. But this is much harder to do in social sciences than in the natural sciences.
(vii) Social Scientists study the world in which they themselves live - the social world of human relation. This creates a special problem for objectivity in a social science like sociology.