Elsevier's Dictionary of Psychological Theories

There really is no end to the making of dictionaries of psychology. Every time I review one I think that surely the market must be saturated by now, but no, still publishers press on, finding new cracks to squeeze another one in through. This latest, based to a considerable extent on Roeckelein's previous dictionary (Roeckelein, 1998), attempts to differentiate itself from the rest of the throng by being centred on “psychological theories”. This, of course, raises the question of what is a theory? Defining a theory is something that philosophers of science have been wrangling over for years...