This chapter summarizes current second language acquisition theory. To do this, it first
describes some very important hypotheses. The first three, the acquisition-learning
distinction, the natural order hypotheses, and the Monitor hypothesis, are reviewed somewhat
briefly, as they have been dealt with a great deal in several other books and professional
papers. Enough detail will be provided, however, to give the uninitiated reader a good idea of
the hypotheses and the sort of evidence that exists to support them. The fourth hypothesis,
the input hypothesis, may be the single most important concept in second language
acquisition theory today. It is important because it attempts to answer the crucial theoretical
question of how we acquire language. It is also important because it may hold the answer to
many of our everyday problems in second language instruction at all levels. Following the
discussion of the input hypothesis, we turn to the concept of the affective filter, a hypothesis
as to how affective variables relate to the process of second language acquisition.
This chapter summarizes current second language acquisition theory. To do this, it first
describes some very important hypotheses. The first three, the acquisition-learning
distinction, the natural order hypotheses, and the Monitor hypothesis, are reviewed somewhat
briefly, as they have been dealt with a great deal in several other books and professional
papers. Enough detail will be provided, however, to give the uninitiated reader a good idea of
the hypotheses and the sort of evidence that exists to support them. The fourth hypothesis,
the input hypothesis, may be the single most important concept in second language
acquisition theory today. It is important because it attempts to answer the crucial theoretical
question of how we acquire language. It is also important because it may hold the answer to
many of our everyday problems in second language instruction at all levels. Following the
discussion of the input hypothesis, we turn to the concept of the affective filter, a hypothesis
as to how affective variables relate to the process of second language acquisition.
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