Is International Relations theory best understood in terms of science or ideology?

Essay will be assessed on the basis of:
    the quality and strength of the argument
    the depth of analysis
    the depth of resources and the overall quality of sources used
    the structure of the paper
    referencing & bibliography
    grammar, spelling and general expression

This is a postgraduate subject, so the argument and analysis need to be substantial.

In answering, please follow the normal conventions of essay writing.

Use a minimum 10 quality textbook and journal sources using Harvard style referencing.