What does C.W. Mills' idea of "Sociological Imagination" entail? How is it scientific?

According to Higgins & Mackinem, what is deviance and who is deviant? Mainly, who/what is NOT deviant?

Check this article.

http://en.wikipedia.org/wiki/Sociological_imagination

I'm not familiar with the work of Higgins and MacKinem, nor could I find any useful information online.