This document discusses citizen engagement and building smart cities. It argues that citizen engagement is key to building smart cities by seeing issues from the citizens' perspective. It notes that different countries face different problems and traditional communication channels are insufficient. Technology like mobile apps can help address this "black hole" issue by facilitating two-way communication between citizens and authorities. The document provides 10 tips for effective citizen engagement, such as gaining buy-in from both parties, using social media channels, outsourcing app development, and having a long-term product roadmap and vision for smart cities. It stresses that citizen engagement is just one part of smart cities and requires an integrated platform.