Playable urban form - a framework of building play-friendly neighborhoods for children

Building a child-friendly city is supporting the sustainable development goal of cities. This concept was firstly proposed in 1996. By 2021, more than 870 cities worldwide have obtained the certification from United Nations Children's Fund. The Chinese government also paid great attention to the child issue. With the efforts of researchers and governments, practices and theories are becoming comprehensive. This paper discusses the child-friendly city at the neighbourhood level. Building a playable neighbourhood contributes to making a child-friendly environment. Children's play space could be divided into two categories: the formal play places, for example, small gardens and playgrounds designed especially for kids, and the other is informal play place, which is not designed for children but gathered with children spontaneously. The network of the playable urban form includes both two categories. The framework of building play-friendly neighbourhoods can be achieved through accessibility, safety, and affordance, which are concluded by literature review, and then this system was got tested for analysis in one neighbourhood of Nanjing, China.