This document discusses error analysis in language learning. It defines the differences between errors and mistakes, with errors resulting from incomplete knowledge and mistakes from lack of attention. It outlines the process of error analysis, which studies the types and causes of errors made by second language learners. Error analysis helps teachers identify areas of difficulty, correct errors, and improve instruction. Learner errors can arise from interference between the first and second languages or from common developmental tendencies. The document discusses various scholars' perspectives on errors and the purposes and importance of conducting error analysis.