Strength - idiographic vs nomothetic approach
reports of social change within society can involve concepts that haven't been tested empirically, meaning they lack scientific credibility
many examples of social change rest on isolated case studies therefore an idiographic approach is often taken.
there's a large amount of subjective interpretation involved in explaining the occurrences of social norms and such evidence should be treated with caution.
However, there's also a large quantity of research supporting processes involved in social change, such as Asch, Milgram and Moscovici which take a nomothetic approach, as they've created universal laws to explain human behaviour under certain social circumstances
Together, these case studies and larger scale studies provide credibility to the underlying processes involved in social change.