Abstract: On June 9, 1989, Employee #1 was hanging a 4 ft by 7 ft 4 in by 5/8 in. piece of drywall on the north wall of the interior of an office building. He was standing on the 11 ft platform of a 12 ft high by 6 ft 1 1/2 in. long by 2 ft 5 in. wide manually-propelled mobile scaffold. Employee #1 was receiving the drywall from a coworker who was standing below on a platform that was 4 ft 3 1/2 in. high. When the coworker jumped from the scaffold it tipped over and Employee #1 was thrown onto the sandy ground. Employee #1 required hospitalization for spinal injuries. Contributing factors to the fall were that: (1) the scaffold was more than four times the minimum base dimensions in height; (2) the casters of the mobile scaffold were not locked to prevent movement; (3) the scaffold did not rest on suitable footing; (4) the scaffold was not properly braced; (5) the scaffold did not have guardrails.