Sociology is AND ISN'T a science - KUHN
Scientific theory exists because it has undergone a series of paradigm shifts (an old way of thinking is replaced by a new one), where there is a unified theory that supports the scientific claim. There are three stages:
Pre-science - a period of discovery where there was no central paradigm.
Normal science - scientists used an established paradigm to support their theory.
Revolutionary science - paradigms are challenged.
Kuhn argues sociology will never pass the period of pre-science because sociology doesn't have a dominant perspective.