Borana society was traditionally arranged in accordance with gadaa, a social stratification method partially based on an eight-year cycle of age sets; yet over the centuries the age sets grew out-of-alignment with the actual ages of their members, and some time in the 1800s another age set system was established.Under gadaa, every eight years the Borana would hold a popular gathering called the Gumi Gayo, at which laws were established for the following eight years.A democratically elected leader, the Abba Gada, will be in charge of over the system for an eight-year term. Gadaa is still in practice and remains significa...