662 ITU‐T's Technical Reports and Specifications The observation web technology [b‐Simonis] aims at breaking through the barriers of the multiple and heterogeneous observing and sensing modes, and at implementing the automatic, real‐time, and comprehensive sensing about the city management and operating status via the web, sensing, and intellectual technologies. The architecture of the observation web technology used in smart sustainable cities is presented in Figure 8. Figure 8 – Architecture of the observation web technology used in smart sustainable cities