Warnings That Don’t Warn

Have you ever read a warning that said something like this:

Use caution when disassembling unit.

Or maybe this:

Wear appropriate personal protective equipment (PPE) when using this product.

Not very helpful are they? Neither one of these examples tells the user what the hazard is. When I disassemble the unit what will happen? Will it ignite if I cross the wrong wires? Will a spring suddenly go SPROINGG and parts fly in all directions? Without knowing what the hazard is, I don’t know what to be cautious of. The second is even worse. Clearly there is some personal injury hazard here from which I need protection…but what is it? Do I need safety glasses to ward off projectiles? Or a respirator to counteract a breathing hazard?

An adequate warning has to accomplish three things:

1. Tell the user the nature and severity of the hazard
2. Tell the user how to avoid the hazard
3. Tell the user the likely consequences of not avoiding the hazard.

The more specific you can make this information, the better. In most cases, saying “spinning blade can amputate fingers” is better than “moving parts can cause injury.” And “Use only outdoors with good airflow” is better than “Use with adequate ventilation.”

Be sure your warnings actually warn.