The researchers collected data on land use, residential housing, commercial industrial buildings, drinking establishments, recreational facilities, street conditions, the number of security persons, children, and teenagers visible, traffic, the physical condition of buildings, cigarette and cigars on the street or in the gutter, garbage, litter on the street or sidewalk, empty beer bottles visible on the street, tagging graffiti, graffiti painted over, gang graffiti, abandoned cars, condoms on the sidewalk, needles and syringes on the sidewalk, and political message graffiti.