Because a lack of adequate data eliminated the possibility of using control groups or historical comparison groups, Colorado's procedure for evaluating state bilingual/bicultural programs was designed to determine whether children in the bilingual program (K-3) had learned more than they would have learned if they had not been in the program. A…

Colorado's bilingual program, which allows Anglo children to participate on a voluntary basis, has been successful in increasing skills in English and in achievement areas measured by English standardized achievement tests, and in improving self concept, attendance, and parent participation. Opponents of bilingual education have claimed that it…