Describe the intended function of each barrier. In the lawn mower example, the guard is an engineered barrier intended to keep items from flying out from under the mower deck.

The Barrier Analysis Worksheet
A worksheet is used to analyze the performance of the barriers. Exhibit 9.6 is a sample worksheet.

List the barriers, as illustrated in Exhibit 9.6. They can be listed by category (failed, not used, did not exist) or type (engineered or administrative).

Describe the intended function of each barrier. In the lawn mower example, the guard is an engineered barrier intended to keep items from flying out from under the mower deck. The procedure of stopping when someone is walking nearby is an administrative barrier that would have prevented a rock from hitting someone.

Evaluate the performance of the barrier. Each barrier is supposed to prevent a hazard from reaching a target. The lawn mower guard failed because it was defective, which allowed the rock to fly out.