The early language environments of low-income Hispanic children can be negatively affected when their Spanish-speaking caregivers face racism, assimilation pressure, and/or misinformed advice based on English-only ideologies. This article reports on the design and efficacy of Háblame Bebé, a language-promoting phone application that encourages…

This dissertation presents the results of three field experiments implemented to evaluate the effectiveness of strategies to improve the health or education of children in developing countries. In Guatemala, community health workers at randomly selected clinics were given patient tracking lists to improve their ability to remind parents when their…

This article discusses issues in measuring lexical diversity, before outlining an approach based on mathematical modelling that produces a measure, D, designed to address these problems. The procedure for obtaining values for D directly from transcripts using software (vocd) is introduced, and then applied to thirty-two children from the Bristol…