Before revision: Both Tilden and Ham appear to be strongly influenced by the views of constructivist learning theorists--in particular, those of cognitive constructivist , Jean Piaget , and social constructivist , Lev Vygotsky.
After revision: Both Tilden and Ham appear to be strongly influenced by the views of constructivist learning theorists--with Tilden influenced by John Dewey, and Ham influenced by cognitive constructivist Jean Piaget and social constructivist Lev Vygotsky.