Should L1 use be avoided in an EFL context, where classrooms tend to be linguistically homogeneous and where students have little opportunity to use English outside the classroom? This article reviews research on native language use in the classroom, how it is used (or not used), and the effects. It addresses topics such as impact on learning, teacher guilt, “covert use,” affective and processing benefits, validating the students’ own language, and solidarity with the instructor. The author concludes that a trend toward what Atkinson calls “judicious use” is reasonable.