Shop Hazards & Typical Incidents Shop hazards incidents can be avoided. An incident is defined as "any observable human activity sufficiently complete in itself to permit references and predictions to be made about the persons performing the act." (Whew!) Therefore, it is safe to say that incidents or accidents do not usually just happen; they happen for a reason and are usually due to unsafe acts or conditions. The following is a list of incidents that have typically led to employee accidents. This list focuses upon shop work, but of course there are many other unsafe acts, conditions, or work activities...