Louis A. Arena University of Delaware Newark, DE This monograph contains select, revised, and invited papers which deal with the topic, Language Proficiency: Defining, Teaching, and Testing. This topic was the theme of the eighth annual symposium held at the University of Delaware. The papers contained in this volume are invited papers or were originally scheduled for presentation and/or presented at the eighth annual Delaware Symposium on Language Studies. The papers combine research con ducted in the areas of teaching, testing, and defining second language pro ficiency within the profession...