In May 2013 a class from IES Baix Camp in Barcelona, Spain and a class from the city of Hong Kong, investigated on «SMART CITIES». As the input angle, they selected modes of sustainable living (Eco-lifestyle). Students and teachers developed a website where we can follow their actions that took place from May 13th to May 31st 2013. After discussing on the latest environmental facilities in the world, students were able to undertake the creation of a revolutionary new eco-life product or to re-think an everyday life eco-product design of their choice that could become more eco-friendly. Following this designing, students had to produce an information leaflet explaining the utility of such a product. Watch them in action!