[Mike Simonds]

I agree. Holding is one of the most difficult calls to make correctly because of the amount of judgement involved. I would say if you are the covering official and you see holding within your field of vision go ahead and call it. If you are the clean-up official and you see holding then use your judgement.

Good points on the difference between holding and personal fouls. Holding is more of a judgement call that can be called or not called based on the proximity to the ball, game situation, etc. Personal fouls should be called at all times.