 Because "Chaco Canyon is the convergence point of all presently documented extra-canyon roads", the area may represent a locus of regional control, or "the apex of the hierarchical system".Powers believes that great houses like Chetro Ketl were involved in civic coordination between the canyon sites and outlying communities.In 1993 David R. Wilcox proposed that a state-level society developed at Chaco, with an administrative center at Pueblo Bonito or Chetro Ketl.