I assume the importance of unifying theories in science but suggest that psychologists do not understand the concept. To clarify, I distinguish unification from both mechanisms and from integration. The psychology literature is replete with mechanisms and also integration, but there is insufficient unification. Finally, I use potential performance theory as an example of unification in a small way in psychology. Given that this theory provides small-scale unification, there is reason to hope for large-scale unification in the future—a goal to which psychologists can and should aspire.
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