 A common strategy when trying to get to a grip of some phenomenon is to model our understanding of its nature on some pre-existing and well-established understanding of the nature of a (supposedly relevantly similar) phenomenon. In this section we survey some instances of this strategy by investigating attempts to model metaphysical explanation as a kind of causal  (§6.1),  nomological  (§6.2),  unificationist  (§6.3),  or pragmatist explanation  (§6.4).