Abstract: At approximately 12:52 a.m. on April 20, 2004, Employee #1, a supervisor with Canwood Construction, and Employee #2 were working at a plush toy warehouse named Kelly Toy USA located in Los Angeles, CA at a construction area of the first floor of a two-story industrial building adjacent to an elevator shaft. Employee #1, Employee #2, and a coworker were on an employee-built wooden platform. Employee #1 was using a nail gun to support an approximate 10-foot beam. Employee #2 and the coworker were assisting in holding the beam. The platform collapsed, causing Employees #1 and #2 to fall approximately 9 feet to the solid concrete below. Employee #1 sustained a fractured left ankle. He was transported to St. Francis Medical Center and admitted and received surgery that day. He was discharged April 23, 2004. Employee #2 received minor injuries to the chest as a result of hitting the edge of the concrete. He was transported to St. Francis Medical Center, received x-rays and was released approximately three hours later. The coworker was not injured. The work platform had been built earlier in the day. It was composed of approximate 2 in. by 6 in. (nominal) horizontally placed wood pieces nailed to perimeter vertical studs and 4 ft by 8 ft by .5 in. horizontally placed plywood. Number 16 penny nails were used to hold the structure together. The causal factor of the accident was: Employer did not provide a scaffold so that employees erecting the ceiling support beams were safe in the work to be done.