This chapter begins with Scott's work on the Australian the central business district (CBD). Scott pointed out how, since the end of World War II, the larger Australian urban centers had paralleled American cities in traffic congestion and in suburban competition for retail trade. The CBDs delimited tended to be elongated along dominant parallel streets and to increase in area roughly in proportion to city size. The CBD is small for the size of the city and is asymmetrical, extending to the north of the PLVI about three times as far as to the south. The regional zonal pattern Young arrived at took both ground-floor uses and uses on other floors into account. A particularly interesting feature in Port Elizabeth is the presence of an outlying business area that Young calls "a non-central business district." A CBD that was found to present some interesting problems in applying the CBI technique was described by Harm de Blij.