One thing I like in this report is that it lists "Roadblocks" which, in the kids cases, are what I have seen others call mis-conceptions, but to me seem like "I am applying an existing mental model that has worked fine up and has worked fine up until now and makes sense to me."
In the adults cases, they seem to me more political problems. That happens when you have a large group of humans. These also need to be understood and dealt with if you want to engender change.
Finally an interesting way for kids to discuss and communicate their ideas about fractions: (thanks to Maria from Natural Math for pointing this one out).