David demonstrates how the analysis of ritual behavior and symbolism may be used as a key to understanding social structure and processes. He extends Van Gennep's notion of the "liminal phase" of rites of passage to a more general level, and applies it to gain understanding of a wide range of social phenomena. Once thought to be the "vestigial" organs of social conservatism, rituals are now seen as arenas in which social change may emerge and be absorbed into social practice.