People or equipment to be used will be the nature of the task. Risk., And the difficulty of the task that will cause maximum success. Or may do any combination.
To use the machine, or as a matter of course, but the nature of the job. The rate of risk and difficulty of work. who will cause the maximum success, or may be shared.
The use of machinery to be selected shall be, but nature of the work. The risk and difficulty of the work, who will make up the success or it may be shared.