Banda Research Project team members use a datum string, pulled tight and leveled with a bubble level, to measure the depth below datum of the excavation unit's surface. Yaw Francis (right) holds the string level as Yaw Frimpong (left) measures the depth close to the bubble level. By taking periodic measurements as they dig across the unit, they ensure that the surface of each completed level is even. A head pan and short handled hoe sit next to excavated dirt in the unit. Maria Dores Cruz (far left) and other team members work on an adjacent excavation unit on Mound 6, Station 6. Makala Kataa, 1994.