Studies of second language acquisition often employ analytical concepts defined relative to the target language. This practice can be a serious obstacle to investigation of crucial questions about the nature of the learners' languages. This comparative fallacy's drawbacks are illustrated through a framework designed to study interlanguage…

Answers to theoretical questions about the place of input in a formal second language acquisition model are dependent on a distinction between two kinds of learner hypotheses. Type-N hypotheses require "negative evidence" for testing, while Type-P hypotheses are tested on the basis of "positive data" alone. (Author/CB)

Discusses the theory that the second-language processing of subordinate clauses and of anaphora is affected by the basic word order of a learners native language. This phenomenon, believed to be a prediction of universal grammar, is explored. (54 references) (Author/VWL)