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Training should be focused on both reducing risk and improving performance. The areas supervisors need training in can be summarized with the 6 C’s of Training: Compliance, Communication, Collaboration, Conflict, Change, and Coaching. I have used the 5 C’s, but overtime have found the concept of Collaboration important enough to separate it out for emphasis.
You’ll note that with the exception of Compliance, all of these areas are skills that fall under the umbrella of leadership. We are really training supervisors on leadership and adding knowledge about compliance.