2. THEORETICAL BACKGROUNDS: ERROR ANALYSIS
2.1. Definition of errors
According to Corder (1981, p. 152), errors are “the result of some failure of
performance” and differentiated errors from mistakes in the way that errors are systematic in nature being “errors of competence” which occur in the continuum of the learning process. They are a noticeable deviation from the adult grammar of a native speaker and the result of learners’ transitional competence. On the other hand, mistakes are “errors of performance” or performance errors that are either a random guess or a “slip,” in that they are a failure to utilise a known system correctly.