Lots of ELT Terms are explained thoroughly and clearly at
The Nile ELT Glossary of ELT Terms
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Errors vs Mistakes
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a mistake vs an error According to Corder (1967) cited by Ellis (2008), a ‘mistake’ is a deviation in learner language that occurs when learners fail to perform their competence. It is a lapse that reflects processing problems. An error, on the other hand, is a deviation in learner language which results from lack of knowledge of the correct rule (pp. 971, 961). global errors vs local...
