Hi Leone37. Setting targets for numbers of incidents has been a discussion topic on this forum several times in the past, with a significant body of opinion against the practice. Saying that we will allow X no of people to be killed or maimed is surely against all principles we hold dear.

Perhaps better to allow the contractor to manage their own H&S to good standards without giving them the "license" to hurt people.

And if you are being asked to set your own levels of harm, ask why.

I would not write any specific numbers into a contract. For starters, the numbers would/should be quite low and therefore not properly measurable. All that is needed is a caveat to prevent or reduce the severity of accidents to as low as reasonably practicable by good h&s practices - job done.