Mast climbing work platforms (MCWPs) are replacing existing elevating devices at construction sites throughout the United States. Since MCWPs are an emerging elevating technology in the United States, systematically analyzed injury data trends associated with MCWP is not available. Nevertheless, OSHA data showed that there were seventeen mason-worker fatality between 1992 to 2009. Seven of them involved a fall from height, including a case in which a masonry worker stepped from the main working platform to the planked working deck two feet below. Another hazard that masonry workers face is back injuries associated with various manual material handling tasks. For masonry workers the prevalence rate for back disorders is 45-50% higher than disorders involving other parts of the body. To reduce exposures involving falls and back disorders and to increase worker productivity, MCWP manufacturers have designed a “production table”, which is a stand that can be placed on top of a MCWP to hold bricks and other materials, creating a level working deck. To further enhance the safety of the stand, our NIOSH research team has modified the table to allow bricks and materials to be placed closer to the worker. The objective of these studies is to evaluate masonry workers’ posture and stability while performing brick laying tasks under three conditions: (1) no production table, (2) use of manufacturer’s production table; and (3) use of the NIOSH-designed production table. Presented by Chris Pan