This chapter deals with slip, trip falls (STF), on the level or on steps and stairs, occurring in the workplace. As with other types of accidents, occupational STF are generally complex events. If we wish to understand the causes and identify the most effective means of prevention of this widespread source of work-related injury, detailed investigation and analysis of factors beyond the simple foot-floor interface is necessary. An ergonomics (systems) approach to understanding STF requires the collection and analysis of information relating to a range of individual, equipment, task, environmental, and organisational factors that may contribute to the risk of occupational falls.