Oscar Newman is an architect and urban designer whose books and theories in urban designing, public houses and preventing crime are so famous. Newsman says when there are some public spaces in high-rise buildings such as public spaces and open spaces, the residences cannot feel any responsibility for their security and maintenance of them and these spaces will be vulnerable. The surveys show that two factors are the most important factors. The physical factors include the size of family and the number of families sharing common entrances.
Two social factors include the rate of income of the family and the ratio of teenagers to adult. So as changing the social structure of residence is impossible, the only possibility to modification is physical improve, it means changing in project size and the number of apartments that are sharing in a common entries