From what has been said above, it should be obvious that grammar is a serious discipline. Its subject-matter is a particular field of human social behaviour which, even at a superficial glance, can be seen to be highly complex. It is a specialist field of study which, like law, engineering, dentistry, physics, mathematics, logic and history (among others), has its own aims and methods, and makes use of concepts which are not necessarily those which enable us to lead our non-specialist everyday lives. A major difficulty in pursuing such a discipline is that one must familiarize oneself with ways of thought that are more discriminating and analytical than everyday thought. Furthermore, along with the new concepts there is inevitably a technical vocabulary. Without a specialist vocabulary, discourse about the theory and practice of the discipline would not be possible. To the beginner the new terminology may seem like an unnecessary burden. This is usually the case when new concepts are not yet fully understood, so that the terminology appears to be just a list of words which are difficult to remember and even more difficult to use. Difficulty of this sort is inevitable in proportion to the difficulty of the new concepts, but the new concepts have an interest and a usefulness which makes the terminological hurdle worth surmounting.