 Kellert, Longino, and Waters advance a pluralism that sees multiplicity not only among but within levels of analysis. Furthermore they see no reason to require that the multiple accounts be compatible. The multiplicity of noncongruent empirically adequate accounts helps us appreciate the complexity of a phenomenon without being in a position to generate a single account of that complexity. They do not hold that all phenomena will support ineliminable pluralism, but that there are some phenomena that will require mutually irreducible or incompatible models. Which these are is determined by examining the phenomena, the models, and the match between phenomena and models. Like Mitchell, Kellert, Longino, and Waters hold that pragmatic considerations (broadly understood) will govern the choice of model to be used in particular circumstances. Both forms of pluralism (compatibilist and noncompatibilist) abandon the notion that there is a set of natural kinds whose causal interactions are the basis for fundamental explanations of natural processes. The noncompatibilist is open to multiple classification schemes answerable to different pragmatic interests in classifying. To this extent the noncompatibilist pluralist embraces a view close to the promiscuous realism articulated by John Dupré (1993). The compatibilist, or integrative pluralist, on the other hand, must hold that there is a way that different classification schemes can be reconciled to support the envisioned integration of explanatory models.