Hi,
I would scrap the idea of an incentive as a material reward. As previous contributors have pointed out that can lead to all sorst of cover up issues.
A scheme I ran early this year was a 'Survivor' competition based on the popular TV series. Each value stream was designated a tribe name and each month they had to turn in various safety tasks to the tribal council to earn points. These together with their safety rate, all counted towards their final score. Important - they were rated on what they did for safety more than on their incident rate.
At the end of each month rather than throw the losing team off the island, the value stream manager of the poorest performing tribe, had to wear a grass skirt for the large management meeting, and their photograph was exhibited in the cafeteria for that month.
Now that got the management excited. There was no way they wanted to wear that skirt. The associates on the shop floor were motivated to do the best they can and keep their tribe up on top.
Yes the winning tribe did get a prize, they all got a tee shirt saying that they survived the island.
All this was done leading up to North American Ocupational Safety and Health (NAOSH) Week, and our company won the most inovative award for Manitoba (That's in Canada!)
Safetystu