Author considers relationship between linguistics and language teaching in reference to how linguistics can provide information (grammar, error analysis, acceptable deviations, standard performance, semantic theory, and test measurements) for language teacher. With a good linguistic background, the teacher is in a position to assess implications…

Relates the central ideas of Wilhelm Vietor to their historical context, since he was the dominant figure of his time, in the history of applied linguistics. Author shows how Vietor's reforms of foreign language teaching found acceptance in subsequent language teaching, particularly in Germany. (SL)