Better data can often make for better decisions, but just as importantly, it can smooth the way for change. Good project evaluation can engage stakeholders in a dialogue about priorities and trade-offs, creating a more transparent decision-making process and ultimately fostering mutual trust. But project evaluation is easier said than done: collecting good data to rigorously evaluate projects can be labor-intensive. Cities leading the way are using data to ensure that infrastructure changes and culture changes keep pace with each other, employing creative new ways to measure project success, leveraging data in how they engage stakeholders, and proving that the perfect need not be the enemy of the good when it comes to how much data to collect.