In recent years, a change in attitude in particle physics has led to our
understanding current quantum field theories as effective field theories
(EFTs). The present paper is concerned with the significance of this EFT
approach, especially from the viewpoint of the debate on reductionism in
science. In particular, it is a purpose of this paper to clarify how EFTs may
provide an interesting case-study in current philosophical discussion on
reduction, emergence and inter-level relationships in general.Comment: 18 pages, LateX2e, to appear in Studies in History and Philosophy of
Modern Physic
