Toronto is sometimes described as a "city of neighbourhoods." It seems an odd description, since nearly all cities contain neighbourhoods, but it is intended to imply that Toronto's neighbourhoods are especially varied and distinctive. However, neighbourhood are not fixed entities. Although some neighbourhoods change very little in their physical, social, and demographic composition over time; others may change significantly in the course of a few years. This report provides a new way of looking at Toronto’s neighbourhoods ? who lives where, based on the socio-economic status of the residents in each neighbourhood, and how the average status of the residents in each neighbourhood has changed over a 30-year period. And it shows that Toronto’s neighbourhoods fall into one of three categories, based on neighbourhood change over time - creating three distinct Torontos. Cities have always had pockets of wealth and poverty. Neighbourhoods in the great cities of the industrialized world have undergone many transitions over the course of their history. However, the City of Toronto’s neighbourhood transition has been relatively sudden and dramatic. (abstract from the document)