Abstract
This study examined preschool teachers' fidelity in implementing a vocabulary intervention. The purpose of the study is to inform the scaling up of vocabulary interventions, identifying strategies that are both feasible for teachers and effective for vocabulary learning. We analyzed data from a vocabulary intervention in which teachers (n = 10) taught 80 new target words to children (n = 138) during shared book reading (BR) and playful learning experiences (PLEs). Teachers were asked to use core intervention strategies, which included both teacher- and child-focused practices. Results showed that teachers had higher adherence to strategies in BR than in PLEs and for teacher-focused strategies versus child-focused practices. Across settings, teachers' use of core strategies and the use of child-focused practices were significantly related to children's vocabulary outcomes. Results not only suggest the importance of child-focused vocabulary teaching strategies but also indicate the need for additional coaching in this area for teachers.