Social constructivism originates from the Russian psychologist, Lev Vygotsky, circa 1932. It obliges students to use collaboration and interdependence to construct meaning through inquiry.
Vygotsky also was the first to articulate the zone of proximal learning, the need for healthy disequilibrium and readiness to succeed through supported learning (scaffolding).
Some websites devoted to variations on social constructivism are
Kath Murdoch - (inquiry based learning consultant)
The following links lead to examples of planning documents that support the inquiry approach for an elementary school.