Perhaps I could mention three things.
The first is that very much every employee has training with respect to SMS, on the expectations, the main policies, but we also gauge and measure whether or not employees believe that. One way is through the reporting rates. The reporting rates from front-line employees have exploded throughout the implementation of SMS, which tells you something initially, that they are comfortable enough to come forward and report. Incidentally, we have only a minute percentage of reports anonymously submitted.
Another thing, as someone else mentioned, we also do annual surveys which ask questions about their trust of the system, a non-punitive system. We get very high marks from employees indicating that they understand how it works and they trust it.