 A history of terminology, though, even when done correctly, tracks the wrong items. The same technical terms are often used to express very different concepts: just consider the philosophical usage of terms like ‘substance’, ‘matter’, or even ‘concept’ itself. Conversely, the same concept is often expressed by different terms, some of which may not be technical at all, a situation that is especially likely at the beginning of inquiry into a subject. So if terminology is to be used as evidence, much more must be brought into consideration – simple word searches will not do.