According to our Brown textbook, Contrastive Analysis Hypothesis (CAH) is the principal barrier to second language acquistion is first language interference, and that a scientific analysis of the two languages in question enables the prediction of difficulties a learner will encounter. One difference between CAH and CLI (Cross-Lingusitic Influence) is that CLI is a concept that replaced the CAH. CLI plays a significant role that prior experience plays in any learning act.
In the classroom, error analysis must be documented, however, teachers should not pay too much attention to learners' error. Teachers should provide positive reinforcement and remember that the student is a learner in progress. Fossilization refers to the fact that some features in a learner's language may stop changing. According to Lightbrown and Spada, fossilization is true for learners whose exposure to the second language does not include instruction or the kind of feedback that would help them to recognize differences between their interlanguage and the target language.
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