National Council for the Social Studies explains the C3
Helpful information on how to implement lessons and units based on the C3 (College, Career and Civic life) Inquiry model may be found here C3 Teachers
The C3 Framework and the National Social Studies Standards
NCSS published the national curriculum standards for social studies in 2010. This article by Michelle Herczog describes the ways in which the C3 Framework for Enhancing State Social Studies Standards, published in 2013, corresponds with the national standards. The article identifies the distinctive contribution made by the C3 Framework.
The Links between the C3 Framework and the NCSS National Curriculum Standards for Social Studies