NEDLER, SHARI, and SEBERA, PEGGY. Intervention Strategies for Spanish-Speaking Preschool Children. CHILD DEVELOPMENT, 1971, 42, 259-267. This study compared 3 strategies of early intervention designed to increase the language and communication skills of disadvantaged 3-year-old Mexican-American children. Treatment group I (T1 included 16 children in a planned Bilingual Early Childhood Educational Program. Group T2 included 16 children who were indirectly involved in a Parental Involvement Program. Group T3 was composed of 14 children in a traditional day-care center. Before and after a 9-month intervention period, all Ss were tested with the Leiter International Performance Scale and the Peabody Picture Vocabulary Test in English and Spanish. On all measures, T1 made significantly greater gains than T2 or T3, indicating the greater effectiveness of the planned Bilingual Early Childhood Education Program.
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Nedler et al. (1971) studied this question.