Occupational slips, trips, and falls on the same level (STFL), have been a severe problem in the workplace for decades. Some of the most recent data about their financial impact on business comes from the Liberty Mutual Workplace Safety Index. Their research finds that the direct cost of STFL is approximately $10 billion annually. Indirect costs, such as loss of worker productivity, can be significantly more than this.
It appears that the first symposiums and conferences dedicated to a better understanding STFLs and their causes were not conducted until the early 1980s, although billions of dollars each year are on the line, not to mention the human impact. However, since then, several conferences have, among other things, helped us define more specifically all the components that make up an STFL.