The Zelinsky Model of Migration Transition claims that the type of migration that occurs within a country depends on how developed it is. It identifies five stages of migration that correspond to a country's level of development: (1) premodern traditional society with little migration, (2) early transitional society with massive rural-to-urban migration, (3) late transitional society where urban-to-urban migration increases, (4) advanced society with reduced rural-to-urban migration and increased urban-suburban migration, and (5) future super advanced society with nearly all migration being urban-to-urban. Everett Lee's model identifies four factors that determine migration decisions: (1) push factors in the area of origin