The digital infrastructure provides the glue to enable the smart sustainable city to operate efficiently and in an optimal manner. Common physical and service infrastructures include (1) Smart Energy, (2) Smart Buildings, (3) Smart Transportation (4) Smart Water, (5) Smart Waste, (6) Smart Physical Safety and Security, (7) Smart Healthcare and (8) Smart Education. Therefore, a smart sustainable city has an end goal to achieve an economically sustainable environment without sacrificing the comfort and convenience/quality of life of citizenry.