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During the past 20 years, he has published well over 100 books and articles and has been invited to deliver over 300 lectures at universities throughout the United States and Canada.Krashen's widely known and well accepted theory of second language acquisition has had a large impact in all areas of second language research and teaching since the 1980s.The 'monitor' acts in a planning, editing and correcting function when three specific conditions are met: that is, the second language learner has sufficient time at his/her disposal, he/she focuses on form or thinks about correctness, and he/she knows the rule.
The 'acquired system' or 'acquisition' is the product of a subconscious process very similar to the process children undergo when they acquire their first language.
It requires meaningful interaction in the target language - natural communication - in which speakers are concentrated not in the form of their utterances, but in the communicative act.
The Acquisition-Learning distinction is the most important of all the hypotheses in Krashen's theory and the most widely known and influential among linguists and language practitioners.
According to Krashen there are two independent systems of second language performance: 'the acquired system' and 'the learned system'.
The monitoring function is the practical result of the learned grammar.
According to Krashen, the acquisition system is the utterance initiator, while the learning system performs the role of the 'monitor' or the 'editor'.Os efeitos deste monitoramento sobre pessoas com diferentes caractersticas de personalidade sero vrios.Pessoas que tendem introverso, falta de autoconfiana, ou ao perfeccionismo, pouco se beneficiaro de um conhecimento da estrutura da lngua e de suas irregularidades.The Input hypothesis is Krashen's attempt to explain how the learner acquires a second language – how second language acquisition takes place.The Input hypothesis is only concerned with 'acquisition', not 'learning'.He distinguishes those learners that use the 'monitor' all the time (over-users); those learners who have not learned or who prefer not to use their conscious knowledge (under-users); and those learners that use the 'monitor' appropriately (optimal users).An evaluation of the person's psychological profile can help to determine to what group they belong.(Veja o texto ao lado e também outra página em português sobre Acquisition/Learning).The Monitor hypothesis explains the relationship between acquisition and learning and defines the influence of the latter on the former.The meaning successfully conveyed constitutes the learning experience.De acordo com sua teoria, acquisition é responsável pelo entendimento e pela capacidade de comunicação criativa: habilidades desenvolvidas subconscientemente.