Force and repetition are two well-known risk factors for musculoskeletal disorders (MSDs). Contributor Sean Gallagher shares the key points and findings resulting from a recent review of scientific articles he and study co-author John Heberger performed. They note that many current ergonomic tools and guidelines consider the factor of repetition to have the same impact on MSD risk no matter the level of force involved. However, their review, published in the journal Human Factors, indicates that it may be the way these two factors are combined that is most important in the development of MSDs.