Colombia’s second-largest city, Medellín, is in the Andes Mountains roughly 1,500 meters (4,900 feet) above sea level. And much of the city’s development extends up the sides of the area’s many mountains. Some of that development took place with little or no planning, with neighborhoods forming as people built small dwellings on available pieces of land. Many of these vibrant communities are located in areas with a high risk of dangerous landslides. A public entity, the Empresa Desarrollo Urbano de Medellín (EDU) used BIM (Building Information Modeling) tools in the Architecture, Engineering & Construction Collection to plan safer communities for people living in these areas.