Despite the importance of learning abilities and disabilities in education and child development, little is known about their genetic and environmental origins in the early school years.

• This study reports results for English (which includes reading, writing, and speaking), mathematics, and science as well as general cognitive ability in a large and representative sample of U.K. twins studied at 7, 9, and 10 years of age
• Presents new univariate, multivariate, and longitudinal analyses that systematically examine genetic and environmental influences for the entire...

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Inventario I: Primeras Palabras y Gestos, sold in packages of 25 for easy re-ordering, is one of the two standardized, parent-completed report forms that make up the the Spanish adaptation of the MacArthur Communicative Development Inventories (CDIs), which was designed by top language researchers to assess language and communication skills in young children ages 8 30 months.

With the Inventarios, professionals can tap into parents' invaluable day-to-day knowledge about their children's language and...