CAAs are intended to promote self-sufficiency, and they depend heavily on volunteer work, especially from the low-income community. The Community Services Block Grant (CSBG) is the agencies' core federal funding. Agencies also operate a variety of grants that come from federal, state and local sources. These grants vary widely among agencies, although most CAAs operate Head Start programs, which focus on early child development. Other programs frequently administered by Community Action Agencies include Low-Income Home Energy Assistance (LIHEAP) utility grants and Weatherization Assistance Program (WAP) funded through the U.S. Department of Energy (DOE).