It closes with a short conclusion. The combined uibanisation level of ASEAN-5 (Association of Southeast Asian Nations) countries increased from 29.5% in 1980 to 51.4% in 2015, and is expected to reach 67.7% in 2050. The aggregated urban population of these five countries increased from 79 million in 1980 to 271 million in 2015, and is forecasted to reach 452 million in 2050. Most of the population growth is happening in small and medium-sized cities.