What is the difference between contrastive analysis and error analysis?

Contrastive analysis is the systematic study of a pair of languages with a view to identifying their structural differences and similarities. Historically it has been used to establish language genealogies.Error analysis assumes that errors indicate learning difficulties and that the frequency of a particular error is evidence of the difficulty learners have in learning the particular form.

The main difference between these two is that the former tries to predict the errors one may make in L2 but the latter identifies the errors from L2 production. source: http://wiki.answers.com/Q/What_is_the_differences_between_contrastive_analysis_and_error_analysis

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