Emergentism is a philosophical position holding that complex systems possess properties, behaviors, or laws that arise from the interaction of their fundamental parts but are not reducible to or predictable from them. A property of a system is said to be emergent if it is a new outcome of some other properties of the system and their interaction, while it is itself different from them. Within philosophy of science, emergentism is analyzed both as it contrasts with and parallels reductionism.