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The purpose of this study was to empirically examine the dimensionality of language ability for young children (4–8 years) from prekindergarten to third grade (n = 915), theorizing that measures of vocabulary and grammar ability will represent a unitary trait across these ages, and to determine whether discourse skills represent an additional source of variance in language ability. Results demonstrated emergent dimensionality of language across development with distinct factors of vocabulary, grammar, and discourse skills by third grade, confirming that discourse skills are an important source of variance in children's language ability and represent an important additional dimension to be accounted for in studying growth in language skills over the course of childhood.

Using data from children in South Korea (N = 145, Mage = 6.08), it was determined how low-level language and cognitive skills (vocabulary, syntactic knowledge, and working memory) and high-level cognitive skills (comprehension monitoring and theory of mind [ToM]) are related to listening comprehension and whether listening comprehension and word reading mediate the relations of language and cognitive skills to reading comprehension. Low-level skills predicted comprehension monitoring and ToM, which in turn predicted listening comprehension. Vocabulary and syntactic knowledge were also directly related to listening comprehension, whereas working memory was indirectly related via comprehension monitoring and ToM. Listening comprehension and word reading completely mediated the relations of language and cognitive skills to reading comprehension.

This study aims to investigate the effectiveness of using interactive digital videos on developing sixth graders' English reading skills and vocabulary learning and its retention. To achieve this aim, the researcher adopted the experimental approach and recruited a sample of 82 6th grade EFL male learners. The researcher used 5 instruments to collect data: 1) A content analysis card of 24 items for the reading comprehension texts of English for Palestine 6B, Holsti's equation was used to count the reliability of the analysis; 2) A checklist for teachers to determine the most important reading comprehension skills; 3) A pre and post reading comprehension test; 4) A pre and post vocabulary test; 5) A delayed vocabulary retention test held after two weeks of the post vocabulary rest. The study results revealed that IDVs were effective in developing reading comprehension, and in learning and retaining vocabulary.

Significant differences in language and self-regulation skills exist among children when they enter formal schooling. Contributing to these language differences is a growing population of dual language learners (DLLs) in the United States. Given evidence linking self-regulatory processes and language development, this study explored bidirectional associations between English expressive vocabulary and self-regulation skills for monolingual English and DLL preschool children (N = 250) from mixed-income families in Los Angeles. Across three time points, findings provide initial support for bidirectionality between these developing skills for both monolinguals and DLLs. Results provide strong empirical support for vocabulary serving as a leading indicator of self-regulation skills in preschool. Findings also suggest that early self-regulation skills play a particularly important role for vocabulary development.

The unique relation of language use (i.e., output) to language growth was investigated for forty-seven 30-month-old Spanish-English bilingual children (27 girls, 20 boys) whose choices of which language to speak resulted in their levels of English output differing from their levels of English input. English expressive vocabularies and receptive language skills were assessed at 30, 36, and 42 months. Longitudinal multilevel modeling indicated an effect of output on expressive vocabulary growth only. The finding that output specifically benefits the development of expressive language skill has implications for understanding effects of language use on language skill in monolingual and bilingual development, and potentially, for understanding consequences of cultural differences in how much children are expected to talk in conversation with adults.

Quantity and quality of caregiver input was examined longitudinally in a sample of 50 parent—child dyads to determine which aspects of input contribute most to children's vocabulary skill across early development. Measures of input gleaned from parent—child interactions at child ages 18, 30, and 42 months were examined in relation to children's vocabulary skill on a standardized measure 1 year later (e.g., 30, 42, and 54 months). Results show that controlling for socioeconomic status, input quantity, and children's previous vocabulary skill; using a diverse and sophisticated vocabulary with toddlers; and using decontextualized language (e.g., narrative) with preschoolers explains additional variation in later vocabulary ability. The differential effects of various aspects of the communicative environment at several points in early vocabulary development are discussed.

This meta-analysis examines the effects of vocabulary interventions on pre-K and kindergarten children's oral language development. The authors quantitatively reviewed 67 studies and 216 effect sizes to better understand the impact of training on word learning. Results indicated an overall effect size of .88, demonstrating, on average, a gain of nearly one standard deviation on vocabulary measures. Moderator analyses reported greater effects for trained adults in providing the treatment, combined pedagogical strategies that included explicit and implicit instruction, and author-created measures compared to standardized measures. Middle- and upper-income at-risk children were significantly more likely to benefit from vocabulary intervention than those students also at risk and poor. These results indicate that although they might improve oral language skills, vocabulary interventions are not sufficiently powerful to close the gap—even in the preschool and kindergarten years.