“Rather than saying that describing the real world is impossible, an instrumentalist will urge us not to worry about whether a theory is a true description of the world, or whether electrons "really, really exist." If a theory enables us to make good predictions, what more can we ask? If we have a theory that gives us the right answers with respect to what we can observe, we might occasionally find ourselves wondering if these right answers result from some deeper "match" between the theory and the world. But we can never expect to know the answer to this question, so what relevance does it have to science? Quite a few scientists have expressed instrumentalist views, especially in physics. The idea that we should ignore questions about the "real reality" of theoretical entities because these questions have no practical relevance is also linked to one strand of the pragmatist tradition in philosophy (Rorty 198z).”