There are four types of #theories i.e., prescriptive, descriptive, predictive, and practice. We can argue that there might be a hybrid theory as well. One that emphasizes that it might not be as straightforward as it seems to assign a theory to an ideal type.
@sgul IDK, I think you could take any category and split it into four subcategories with a little rhyming and alliteration. What type of theory is that?