Mr. Niall Cussen:

Some of those older housing developments from the 1960s and 1970s that are being regenerated were built according to principles of extremely low density, often with houses spread over a very large area. Sometimes there were green spaces that really did not function very effectively as green spaces because there was no real supervision of them and nobody looking onto them. There were spaces left over between housing developments. It is often the case when looking afresh at an area that you will try to achieve more effective use of the land but also passive surveillance, security and so on.