Abstract
Debates over reduction and emergence have raged in both philosophy and the sciences. Both sets of debates are surveyed to illustrate the ongoing discussions driven by the sciences and why they are rather different than philosophers commonly suppose. Unlike philosophical debates, scientists on both sides of their discussions accept that composition is universal in nature, that multiple realization exists, and that higher sciences are indispensable. The ongoing debates instead focus on the ontological structure of a certain kind of common case, including what entities are determinative and the varieties of determination.