Neighbourhoods form important units, especially according to PPS - the American nonprofit organisation 'Project for Public Spaces'. That is because it is in neighbourhoods that people interact most regularly and naturally, making it the perfect place for problem solving and creating local engagement. The 'Great Neighbourhood Book', published by PPS, was designed to inspire people to take on active role in their own community. It shows how to create great places where people can thrive and shares the most important lessons in the field of successful placemaking.