Abstract: After Employee #1, a carpenter, tacked a job-built scaffold into place, he left Employee #2, his helper, to finish nailing the boards into place. When Employee #2 finished, he and Employee #1 got on the scaffold to install soffit work. The scaffold collapsed and the employees fell 22 ft 5 in. to the ground. Employee #1 sustained bruises; Employee #2 suffered fractured facial bones and bruises. Close examination of the support arms revealed that although the left side of the scaffold had three nails to a row for three rows, the right arm had only two nails supporting it. Employees received on-the-job training; however, there are no work rules regarding the scaffold.