This month we're stepping back from large-scale system failures to look at a pattern of incidents that seem trivial on their own, but taken together, injure many of our employees: slips, trips and falls. In 2010, such incidents accounted for more than 40 percent of NASA's lost time injury mishaps. Of those injuries, 75 percent were falls on the same level, or slips and trips that injured but did not result in a fall. Most injuries took place during normal activities rather than high-risk operations. To tackle this systemic problem, we need to find and mitigate trip hazards when feasible, while keeping ourselves mindful and vigilant of changing conditions, be they our physical limitations or changing environments.