The FastMApp: Development and Standardization of an App to Assess Vocabulary Development in Spanish in 18-to-32-month-olds / La FastMApp: diseño y baremación de una aplicación informática para la evaluación del desarrollo del vocabulario en español entre los 18 y los 32 meses de edad

Vocabulary development is crucial not only for the acquisition of language skills but also for a wide range of cognitive and communicative abilities. In this study, we examine the processes underlying the addition of new lexical labels into young children’s vocabularies. This perspective enables us to move beyond the mere quantification of words understood or produced, which carries important practical implications. To this end, we administered and standardised a fast-mapping task through a freely available Android tablet app to 252 European Spanish–speaking children. Data on construct validity are also included. The findings are discussed in relation to previous research and children's broader language skills. Finally, normative data are presented for the 18-to-24- and 25-to-32-month age groups, with potential applications in both educational and clinical contexts.