This document discusses error analysis in linguistics. It defines an error as a systematic deviation from the rules of the target language that occurs when a learner deviates from the norms of the language being learned. There are two main types of errors: interlingual errors, which are caused by the native language, and intralingual errors, which occur within the target language itself. The causes of errors include overgeneralization, incomplete application of rules, transfer from the native language, teaching style, learning materials, and literal translation. The steps of error analysis are collecting data, identifying errors, describing errors, explaining errors, correcting errors, and drawing conclusions.