Given our experiences in Ibeku (Uumuahia Ibeku) Nigeria, the third category of construction is very useful for generating models. These are models derivable from oral traditional data and ethnographic resources. Such models, if carefully applied to archaeological situations, can greatly fill the gaps in our knowledge of the past of the Ibeku peoples. References http://www.umuahiaibeku.com/index.html http://ibeku.exactpages.com/History3.html Igbo subgroups