Despite considerable work concerning relationships between cognition and language in the second year of life, these relationships remain obscure. Clarification depends on resolution in at least three major areas. First, studies should be expanded beyond the scope of cognitive prerequisite models that have been difficult to conceptualize and that…

The research discussed here, primarily that of P.J. Gal'perin and his associates at the University of Moscow, is an experimental demonstration of basic tenets of Vygotsky's theory. According to Gal'perin, grammatical knowledge is formed first by teaching the students material grammatical actions; these actions are ultimately to become mental…