For a language is really alive only as long as there is someone to speak it to. When you are the only one left, your knowledge of your language is li… - David Crystal

Language death is a terrible loss, to all who come into contact with it: `Facing the loss of language or culture involves the same stages of grief that one experiences in the process of death and dying.”‘ We do not have to be members of an endangered community to sense this grief, or respond to it. Anyone who has worked with these communities, even over a short period, knows that it is a genuine insight, well justifying the dramatic nature of the analogy. And it is this keen, shared sense of loss which fuels the motivation and commitment of linguists, community groups, and support organizations in many parts of the world.

We now know that linguistic change does not operate in such an across-the-board manner. Some speakers introduce the change into their speech before others; some use it more frequently and consistently than others; and some words are affected before others. A more accurate view is to think of a change gradually spreading through the words of a language – a view that is known as a lexical diffusion. At first just a few people use a change sporadically in a few words (commonly occurring words are influenced very quickly); then a large number of words are affected, with the sound gradually being used more consistently; then the majority of the words take up the change.

The structural properties of the language are many and complex, but at least they are finite and fairly easy to identify: there are only so many sounds, letters, and grammatical constructions, and although there is a huge vocabulary, at least the units are determinate and manageable.