Sequence of Societies
(1) Solitary society: I = <{single individual}>
(2) Group consisting of several individuals: G = <{Ii: 1 < i < m}, SG>
(3) Band society/community composed of several groups: B = <{Gi: 1 < i < n}, SB>
(4) Tribal society/simple chiefdoms composed of several B's: T = <{Bi: 1 < i < p}, ST>
(5) Complex chieftains composed of several T's: C = <{Ti: 1 < i < q},SC>,
where SG, SB, ST, SC, stand for the internal organization of the units making up a society at a particular level in the sequence.