The document discusses four key concepts in town planning development:
1) The Garden City Concept from 1902 aims to address overpopulation and congestion through self-sufficient, planned communities of around 32,000 people surrounded by greenbelts.
2) The Neighborhood Unit from the 1920s arranges residential areas around a central hub to improve social conditions and infrastructure, with schools and shops at the center serving around 5,000 people.
3) Parallel Towns from the 1930s focus development along major transportation corridors with housing, industry, and green spaces arranged on either side.
4) Urban Land Use Models from the 19th century propose concentric zoning of land uses from the city center outward, separating residential,