- Human error, such as a mistake made by an individual worker or operator
- Inadequate training or experience of the involved workers or operators
- Poor communication, such as misinterpretation of instructions or lack of coordination
- Fatigue or sleep deprivation of the involved workers or operators
- Improper use of equipment or machinery
- Lack of maintenance or improper maintenance of equipment or machinery
- Equipment or machinery failure or malfunction
- Slip, trip, or fall hazards
- Improper use of personal protective equipment or failure to wear PPE
- Improper lifting or handling of heavy objects
- Contact with harmful substances or materials
- Electrical hazards or contact with electrical energy
- Fire or explosion hazards
- Machinery or equipment entanglement hazards
- Working at heights without proper fall protection
- Chemical spills or leaks
- Exposure to extreme heat or cold
- Vehicle accidents or collisions
- Confined space hazards or improper entry into a confined space
- Improper use of tools or hand-held equipment.