Part 1 Interaction and second language acquisition: teacher-pupil interaction in second language acquisition the classroom context - an acquisition-rich or an acquisition-poor environment? Part 2 Formal instruction and second language acquisition: can syntax be taught? A study of the effects of formal instruction on the acquisition of WH questions by children are classroom and naturalistic acquisition the same? A study of the classroom acquisition of German word order rules the role of practice in classroom language learning. Part 3 Variability and second language acquisition: sources of variability in interlanguage interlanguage variability in narrative discourse - style-shifting in the use of the past tense. Part 4 Learning styles and second language acquisition: individual learning styles in classroom second language development classroom learning styles and their effect on second language acquisition - a study of two learners. Part 5 From research to pedagogy: second language learning and second language learners - growth and diversity contextual variability in second language acquisition and the relevancy of language teaching grammar teaching - practice or consciousness raising?