Krashen (1982) speaks about three kinds of errors, which he considers the most
relevant errors that are to be dealt with: global errors, stigmatized and the most
frequent errors. Global errors, which make communication impossible because
they disable the comprehension of the communicative message, are necessary to be
corrected. Stigmatized errors (use of taboo words, socially unacceptable words or
violent language) are to be treated immediately. The group of the most frequently
occurring errors includes errors which are to be corrected no matter which group
they belong to.