This document outlines the process of error analysis in linguistics. It defines error analysis as the study of errors made by second language learners. The key steps in error analysis are: 1) collecting samples of learner language containing errors, 2) identifying and classifying the errors, 3) describing the errors by comparing the incorrect and correct forms, 4) explaining the possible sources or causes of the errors, and 5) correcting the errors. The sources of errors can include overgeneralization, incomplete rule learning, mother tongue interference, teaching methods, and carelessness. The goal of error analysis is to help both teachers and learners understand learner difficulties and language acquisition.