In a smart city, data, services and sensors are inter-operable. Each application should be able to be plugged into some sort of "data socket," so to speak, to immediately extract the necessary data and plug in new data. Garbage can filling rates, rainfall, logistics flows, air quality, demographics, health, water quality - it's all connected. If you want to solve a policy issue, you can ask a discipline-related question, but the answer is always interdisciplinary: it always relates to multiple policy domains and policy levels. Technology is then crucial to make the data interdisciplinary interoperable. It should be possible to standardize data flows so that we can exchange data uniformly - and with respect for privacy - between the public and private sectors."