A survey and analysis of second language theory discusses the development of ideas in this expanding area of language studies. It looks at the implications of these ideas and directions for future research. Contains study questions and activities as well as practical guidelines on the use of available research resources.

Part I: towards theory --A quick round tour -- Learner systems -- Creative construction -- Analysing interlanguage -- Part II: Revisions and alternatives -- Early refinements -- Theoretical developments -- Part III: the coming of age -- Theoretical applications of linguistics -- The role of UG in second language learning -- Implications and applications.