Subtractive Schooling provides a framework for understanding the patterns of immigrant achievement and U.S.-born underachievement frequently noted in the literature and observed by the author in her ethnographic account of regular-track youth attending a comprehensive, virtually all-Mexican, inner-city high school in Houston. Valenzuela argues that schools subtract resources from youth in two major ways: firstly by dismissing their definition of education and secondly, through assimilationist policies and practices that minimize their culture and language. A key consequence is the erosion of students' social capital evident in the absence of academically oriented networks among acculturated, U.S.-born youth.