Supports and expands upon S. P. Corder's theory that all the utterances of a language learner are well-formed and appropriate. (PMP)

A description of an analysis of 10,000 errors made by Finns and Swedes who were learning Finnish or Swedish as a foreign language. A new classification of errors is established and a precise definition of language mixing is given. Five types of errors are described. (AMH)

A brief discussion of the role of contrastive linguistics and transformational generative grammar in studying transfer and interference in language learning. The base language is not necessarily the mother tongue. It is the language known by the learner which most closely resembles the new language being learned. (AMH)

Describes a study that tests whether the sociolinguistic differences observed in essays in German are a carry-over from the native Scottish English. A previous study is described which tested the hypothesis that social class influences linguistic behavior and could be a cause for errors in a foreign language. (AMH)