With high fatality and injury rates, forest operations are among the most dangerous jobs in the United States. Accidentally thrown objects are a major cause of concern for machine operators. Working with the U.S. Forest Equipment Standards Committee in SAE and the International Organization for Standardization, SRS researchers examined the effects of material, temperature, and design variations on the risk of window failure in forest machines. SRS research results were translated into a new standard for testing and classifying window materials used to protect operators. The Station's research will enhance forest equipment design around the world and improve safety in forest operations.