 Bächtold (2008a,b) takes an approach to quantum theory he calls pragmatist. Quoting C.S. Peirce’s pragmatic maxim, he offers what he calls pragmatic definitions of terms used by researchers in microphysics, including “preparation”, “measurement”, “observable”, and “microscopic system”. His “pragmatist” approach to interpreting a theory is to isolate the pragmatic functions to be fulfilled by successful research activity in microphysics, and then to show that quantum theory alone fulfills these functions.