The evolution and evaluation of an elementary level structured immersion program in English as a second language are described. The program provides all academic instruction in English, but at a level that students can understand. It is ungraded, uses bilingual teachers who speak the students' native language, and has both developmental and direct…

Fifty randomly selected moderate and low implementing Distar Language teachers were retrained in techniques of correcting students' mistakes and recycling through an instructional task until all of the children in the group responded without error (criterion teaching). As a result of retraining, the experimental teachers performed at a…