This volume in honor of Susan M. Gass focuses on interaction in second language acquisition from multiple perspectives. International experts in the field of SLA contribute insights and explanations on the interaction approach's compatibility with other theoretical approaches, key empirical studies, interaction in specific contexts, and future directions. Readers will find an enriching discussion of how the interaction research tradition is viewed in a wide range of different appraoches to learning and teaching second languages.

Alison Mackey is Professor of Linguistics and Head of Applied Linguistics Programs at Georgetown University.

Charlene Polio is Associate Professor in the Department of Linguistics and Germanic, Slavic, Asian, and African Languages, and Director of the MA Program in Teaching English to Speakers of Other Languages (TESOL) at Michigan State University.