Carpenters employed by concrete contractors spend much of their time assembling, erecting and dismantling the plywood forms for concrete pours, forms which are usually reused on subsequent projects. Researchers mapped out the work tasks involved, then used interviews with carpenters, as well as a review of OSHA case reports, to identify the work tasks entailing the highest risks. The team also tested plywood samples in the laboratory to test how well they retained strength after repeated use.