Reducing Modality

For "Reduction is Good" see Sider's "Reductive Theories of Modality". (For his in-progress attempt at a non-Lewisian reductive theory see here. See also his "The Ersatz Pluriverse" for a detailed formulation of the sort of AR view I was sketching last time.)

For "Reduction is Bad" see Plantinga's "Two Concepts of Modality: Modal Realism and Modal Reductionism" (JSTOR access required.)