To become a competent trainer, you need to attend train the trainer course. One of the provider is from NIOSH. This course need 5 days to complete. In the end of the training, candidate need to submit request document and present to the panel.
1)Lecture: 15 minutes
2)Assesment :5 minutes
a) Written Assesment: 2 minutes
B) Practical Assesment: 3 minutes

So, this video is the sample of the presentation. Can comment if you need more info.
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