To do science is to find patterns, and scientists are always looking for p- terns that they can use to structure their thinking about the world around them. Patterns are found in data, which is why science is inevitably a qu- titative study. But there is a difficulty in finding stable patterns in the data since many patterns are temporary phenomena that have occurred r- domly, and highly sophisticated empirical methods are necessary to dist- guish stable patterns from temporary or random patterns. When a scientist thinks he has found a stable pattern, he will generally try to capture that pattern in a model or theory. A theory is essentially a pattern, and thus theory is a central part of science. It would be nice to have a single pattern - a unified theory - that could serve as a map relating our understanding with the physical world around us. But the physical world has proven far too complicated for a single map, and instead we have had to develop smaller sub maps that relate to small areas of the physical world around us. This multiple theory approach presents the pr- lem of deciding not only what the appropriate map for the particular issue is, but also of handling the map overlays where different maps relate to overlapping areas of reality. It is not only science that is focused on finding patterns; so too are most individuals.
