Phase late transitional society 1. slackening, but still majod movement from countryside to city 2. Lessening now of migrants to colonisation frontiers 3. Emigration on the decline or may have ceased altogether structural complexity Phase IV The advanced society Residential mobility has levelled off and oscillates at a high level 2. Movement from1 Countryside to city continues but is further reduced ir absolute and relative terms 3. vigorous movement of migrants from city to city and within individual urban agglomerations 4. if a settlement frontier has persisted, it stagnant or actually redreating skilled an 3. Significant net immigr unF semi-skilled workers from relatively underdeveloped lands