Does an internal audit need to be conducted by someone internal to your organisation?

I thought the training was very good. It was clear and logical. The trainer was very knowledgeable, approachable and friendly, which makes it easy to stop and ask questions or to clarify a point. I was particularly impressed by his explanation of why we need to be mindful of the language we use and what the standard is actually asking for; most of it is common sense, but understanding what it actually means and what is required is key, so that really resonated with me.