In The Structure of Scientific Revolutions (SSR) Thomas Kuhn argues that science oscillates between prolonged periods of normal science and periods of chaotic reshuffling, called revolutionary science. During periods of normal science the scientific community agrees on a set of fundamental/basic beliefs called a paradigm (SSR, 10). The paradigm contains four fundamental categories of knowledge, (i) firmly established symbolic laws (e.g., f = ma), (ii) metaphysical worldviews (e.g., that matter is composed of atoms), (iii) values ​​( for example, that theories should be coherent, plausible and simple) and (iv) methodological knowledge (often a tacit understanding of how to solve scientific problems). This knowledge was, and is, a prerequisite for becoming a scientist, which is why the paradigm is sometimes called the “disciplinary matrix” (1970, 182). Research during periods of normal science is not innovative (SSR, 35). .Instead, research consists of (i) solving problems very similar to those that have already been solved, or (ii) refining answers that have already been obtained (both SSR, 34). Frank Parajes (2004) describes the process as "mopping up". Kuhn uses the term puzzle-solving to refer to this type of work (SSR, 35-43). The term "puzzle-solving" alludes to puzzles, Kuhn says that in solving scientific puzzles, as in puzzle solving, the solver can expect to find concrete solutions (SSR, 38) by employing familiar algorithmic rules (SSR, 38; Bird, 2004). The whole endeavor may seem easy, boring, and senseless, but scientists enjoy the challenge and can earn a reasonable salary (SSR, 38; Pajares, 2007). Sometimes observations appear that repudiate/question the authority of the paradigm... middle of paper ......l Disparity between Newtonian and relativistic mechanics. The British Journal for the Philosophy of Science, 24 (3): pp. 270-276.[9] Oberheim, Eric and Hoyningen-Huene, Paul. 2009. The Incommensurability of Scientific Theories in the Stanford Encyclopedia of Philosophy. Available on the World Wide Web at http://plato.stanford.edu/entries/incommensurability/. [Accessed 15 November 2009] [10] O'Connor, J.J. and Robertson, E.F. 1996. Urbain Jean Joseph Le Ver-rier in The MacTutor History of Mathematics Archive. Available on the World Wide Web at http://www-history.mcs.st-andrews.ac.uk/. [Accessed 15 November 2009] [11] Parajes, Frank. 2004. The Structure of Scientific Revolutions. Available on the World Wide Web at http://www.des.emory.edu/mfp/Kuhn.html.[Accessed November 12, 2009]