Chapter 2 provides an overview of smart technological developments covering three areas: smart individuals; smart buildings; and smart environments. A key element of smartness across all these areas is sensorisation and the rapid spread of sensorised devices that enable new forms of data collection. Focus is placed on the smartphone as a sensor collecting device that can be used for individual, communal and societal purposes. Other sensors, such as bio-implants and smart pills are examined. The analysis of smart buildings examines the smart home, workplaces and stores. The use of sensor data in smart cities is also examined. Chapter 2 demonstrates the intractable link between notions and benefits of ‘smartness’ and sensor data collections.