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)

A study of certain aspects of second language learning among three university students, all in an advanced ESL class at UCLA. An error analysis of written verb forms was undertaken. An examination of correction revealed that it was neither systematic nor enlightened enough to actually influence error production. (Author/RM)