The document discusses building smart cities through empowering citizens and making use of crowdsourced data. It describes how integrating data from multiple sources, automating data collection, and analyzing data can help identify actionable insights to address challenges facing cities. Citizens can play a key role by using their smartphones to sense and report issues like traffic, noise, or drainage problems through mobile applications. Aggregating data from both sensors and crowdsourcing can provide a holistic view of the city to support better decision making. However, key challenges remain around data ownership, legal liability from citizen reports, and ensuring data is used to meaningfully improve life in cities.