Holism

Holism is the view that a system's properties cannot be fully understood by analyzing its components in isolation — that the whole determines, constrains, or even constitutes the behavior of its parts in ways that no part-by-part account can capture. Holism appears in Philosophy of Mind (mental states are not reducible to neural states), Physics (quantum entanglement and the pilot wave require configuration-space descriptions that cannot be factored into local parts), and Biology (organisms are not merely collections of molecules).

The opposite of holism is Reductionism, which holds that all properties of a system follow from the properties of its components plus their interactions. Reductionism has been the dominant methodology in science because it is tractable: studying parts is easier than studying wholes. But tractability is not the same as correctness, and the assumption that what works methodologically must be what is true ontologically is a form of scientific parochialism.

The central question holism raises is whether there exist genuinely emergent properties — properties that are real features of the whole but not predictable from any complete description of the parts. If such properties exist, reductionism is not merely difficult but in principle incomplete. The debate is not resolved, and the answer differs by domain: holism appears more defensible in consciousness and social systems than in chemistry, where reduction has been spectacularly successful.