1) The document outlines the process of identifying and describing errors made by language learners. It discusses overt errors, which are ungrammatical at the sentence level, and covert errors, which are grammatically correct sentences that do not make sense in context.
2) It provides a procedure for identifying errors, determining if a sentence is overtly or covertly erroneous, and reconstructing the sentence to understand the error. If the learner's native language is known, the sentence can be translated to and from that language.
3) Common error types are described as errors of addition, omission, substitution, or ordering, which can occur at the phonological, lexical, grammatical or discourse levels. While broad, these