Understanding how science operates is imperative for evaluating the strengths and limitations of science, as well as the value of different types of scientific knowledge. For instance, science teachers may understand the atomic model, Boyle’s law, and evolutionary theory, but may not understand what law, theory, and model mean in the discipline of science. Hence, ridiculous statements like, "evolution is only a theory" or "when such-and-such a theory is proven it will become a law" may result. One of the major theses of Michael Martin’s, (1972) book Concepts of Science Education: A Philosophical Analysis is that philosophy of science study is beneficial to the science educator. Studies in philosophy of science will clarify teachers’ thought about the nature of science and help them understand the roles and methods which guide study in the discipline. As Manuel, (1981) writes