Reviews the notions of system and variability as applied to interlanguages, especially with respect to variability in the syntax of second language learners. Summarizes the findings of Huebner with respect to referentiality and then examines some new data collected 20 months after the end of the initial study. (SED)

This paper reports on the development of the article system in an adult's interlanguage over a one-year period. It compares the results of a conventional order-of-acquisition analysis with a paradigm model based on Bickerton (1975). (Author/CFM)