A look at social policy in light of the Los Angeles -- and national -- turmoil with sociologist Christopher Jencks. Does welfare work? Did Johnson's Great Society fail, as the Bush administration now posits? Or is it the fault of the massive cutbacks of the Reagan-Bush era? Jenck's new book is called "Rethinking Social Policy: Race, Poverty and The Underclass." (Harvard University Press) (Interview by Marty Moss-Coane)