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Aims:
The current study seeks to better understand the effects of input quantity, input quality, and output on the French vocabulary development of early-elementary school students attending a French–English dual language immersion (DLI) program in the United States.
Design:
The participants were 42 early-elementary students attending a French–English DLI program, who participated in a longitudinal study. At the beginning of the study, they experienced variability in out-of-school French input and output.
Data and analysis:
Data on out-of-school French input and output came from parents’ responses on a survey. Children’s French receptive vocabulary was measured using their scores on the Échelle de Vocabulaire en Images Peabody, while their French expressive vocabulary was measured using the number of different words employed on a picture description task. Their vocabulary skills were assessed over one year, and data from the five time points were used to fit a longitudinal growth model.
Findings:
Students who were exposed to more French input had higher scores on the French receptive vocabulary measure at baseline, whereas those who produced more French output had higher scores on the French expressive vocabulary measure at baseline. Maternal French proficiency had no significant effect on French receptive and expressive vocabulary scores at baseline.
Originality:
Few previous studies, if any, have analyzed the associations between input, output, and vocabulary development in the DLI context; that is, the extent to which children’s vocabulary trajectories in the partner language are affected by their out-of-school input and output experiences.
Implications:
Bilingual programs ought to emphasize both input and output in the target language given their unique contribution to children’s receptive and expressive language skills. Also, future research on bilingual vocabulary development should examine input and output in both languages.
