Tests to discover the nature of the second language learner's language are discussed. Such tests are based on the assumptions that the development of the system of the foreign language in the learner follows certain regular patterns, and that the learner's grammar is essentially systematic at any stage of his learning. (RM)

This article describes a series of experiments concerning the relationship between cognitive processes and learning a second language. Similarities and differences between first language acquisition and second language learning by children and adults are discussed. (CFM)

Argues against the teaching of foreign languages to children under the age of ten, basing conclusions on empirical and theoretical evidence. (CLK)

Discusses problems and issues in naturalistic (non-school) acquisition of the phonology of a second language (L2). The data come from a longitudinal study of four German-speaking siblings learning English as a second language within an English-speaking community without classroom instruction. (KM)

The development of German proficiency by a three-year-old Australian boy living in Germany was monitored for a five-month period. His command of German negation is reported. The study is seen as bearing on issues in first and second language acquisition, such as competence and interference. (JB)