It would be interesting to see if further studies have been about the barriers.
And yet here comes Sheryl Sandberg, talking about the barriers we can control.
In a novel about the barriers of racial prejudice, where mutual incomprehension seems the rule, the narrative method is appropriate.
Rebecca, 15, and Maisie, 14, winners of the Steve Sinnott award, travelled to Uganda to learn about the barriers to education faced by children with disabilities.
Despite her obvious passion, she is realistic about the barriers people face when getting out on the roads for the first time.
"Social workers, teachers and police officers have told us about the barriers they face when they want to help a child who they suspect is being neglected.
Wilson does not discount any of these solutions, but she is realistic about the barriers that stand in the way of systemic change.
When you think about the barriers facing deaf and disabled people, it's easy to think about obstacles in the physical world.
In fact Chris Ham, chief executive of the King's Fund, in a recent blog about the barriers to integrated care, identified these elements as priorities.
It portrayed the possibility of love between two people of the same sex that was positive and affirming, yet realistic about the barriers.
The kids are learning about the barriers to healthy, affordable and local food, and thinking about how to knock them down.
