Many workers are injured as a result of slips, trips and falls and these injuries can be very serious. OHS reps can take steps to reduce the risks to workers.
WorkSafe has developed a good general resource:
Preventing slips, trips and falls at work This is a checklist designed to help employers meet their legal obligations to manage risks associated with slips, trips and falls.
WorkSafe (Transport & Storage) has also developed a useful "Slips, Trips and Falls Checklist" designed specifically for those who work in the retail sector (download from the right hand side of this page). It is can easily be modified, however, for use in any workplace.