“…This study had several features associated with higher effect sizes in meta‐analyses: A researcher, rather than teachers or childcare providers, delivered the intervention (Marulis & Neuman, ; Mol, Bus, & de Jong, ); author‐created, rather than standardized, measures were used to assess growth (Marulis & Neuman, ); and instruction combined both explicit (e.g., giving definitions) and implicit methods (e.g., embedding target words in guided play; Marulis & Neuman, ). The large effect sizes may also be partially driven by our selection of target words, as the concrete nouns taught in the present study are typically learned more quickly than more abstract words such as verbs and adjectives (Hadley et al., ; Maguire, Hirsh‐Pasek, & Golinkoff, ).…”