our best explanation for set of observed relationships among 2 or more variables.
A theory should:
Have predictive accuracy (support from results)
Have internal coherence
Be economical (parsimony) Come up with the simplest possible answer to explain the results
Be fertile (heuristic, lead to many testable hypotheses)
A theory advances general knowledge in a specific area, its goal isn't to be right and in fact they are NEVER proven