If you read my article in the Safety 1st column last week, you would have noted that in situations as noted above may require a different system of competency. If he did 'okay' at the end, maybe he is a low level competent person meaning he should only be dealt menial tasks, and more difficult tasks handed out to the experienced, or better operators. With time, hiopefully, his skills will improve and then his supervisor can dole out more difficult tasks. That is what I do.