The world's predominant growth populations are largely students of color wh
o have historically struggled for high-quality educational opportunities. W
ithin this context, educational reformers around the globe are challenging
teacher preparation programs to prepare teachers to work effectively with s
tudents from diverse backgrounds. This article reports on a cross-national
study that investigates a program designed to facilitate the development of
teachers who are committed to teaching culturally and linguistically diver
se students. It presents an analysis of US and South African teachers' deve
loping discourses that revealed differences in the development of commitmen
t among teachers who engaged in talk-related activities in a teacher educat
ion program versus those teachers who engaged in talk-related activities in
addition to theory-enacting activities within diverse classrooms. Through
the analysis, I explore how teachers' developing commitment can be facilita
ted by carefully designed classroom activities and show how those developin
g commitments are revealed in the teachers' discourse practices.: My intent
in presenting this investigation is to help us better understand how appli
cations of activity theory can assist us in addressing the global challenge
s that face teacher education programs. (C) 2000 Elsevier Science Ltd. All
rights reserved.