Conventional urban design has organized and deployed systems of physical objects to create more functional, sustainable and pleasing cities. Now, a multitude of mostly non – physical, information based technologies and applications have added another vital layer to the designer’s toolbox. I call this the “I” layer – for information. Unlike the physically based systems/layers of traditional urban design, the “I” layer is comparatively easy to implement and relies on very little or no physical infrastructure. Both public and private sectors can contribute; building networks that make cities more vibrant and efficient.