This I don't fully agree with. I used to train this way, but now find it is more effective to do isolation first. Think about it, training chest? Try starting with incline pec fly, then incline bench, then decline fly, decline bench (or dips) cable cross overs (upper then lower) and throw biceps in at the end. This way you can totally destroy your chest without your triceps or shoulders giving in mid session. Then train shoulders and triceps a few days later on their own.
Not saying there isn't more then one way to train, but mixing it up helps.