Concepts of Science a Philosophical Analysis, Paperback by Achinstein, Peter, ISBN 0801812739, ISBN-13 9780801812736, Brand New, Free shipping in the US While the scientist works essentially with what he observes, with the measurable properties of nature, the philosopher of science is concerned to formulate the conceptual foundations of the scientific method. In this systematic study, Professor Achinstein analyzes such concepts as definitions, theories, and models, and contrasts his view with currently held positions that he finds inadequate.