1) The document discusses BA Obras, a civic tech project in Buenos Aires that created an open public works observatory to increase transparency around public works projects. 2) The observatory initially covered 70 public works but the government saw benefits to expanding it to include all ministries. This led to unexpected governmental changes promoting more transparency. 3) The observatory grew to cover over 800 public works across 13 government areas, resulting in over 1000% data growth in one year. It provides detailed, geo-located information for citizens and journalists on the city's public works projects.