Kate, 41, wore a purple suit as she delivered a landmark speech at the Design Museum in London, setting out a manifesto for global change to create an international framework for the social and emotional life skills children need to learn in preparation for adulthood.
Before she entered the auditorium she spoke to compere and television presenter Fearne Cotton about the project.
She said: “Louis’ class, they came back with a feelings wheel. It’s really good.”
The Princess added: “These are five or six year olds and going with names or pictures of a colour that represents how they feel that day.
“So there is a real keenness in school particularly to get involved in conversations. It’s actually helping continuity across the board and then how does that feed into you, with your mental health? “
Louis, five, is a pupil at Lambrook preparatory school in Berkshire, where his siblings Prince George and Princess Charlotte are pupils.
Kate said: “To be able to find a bit of framework, to talk about this, is very important.”
Asked by mum-of-two Feane how she was feeling, the Princess replied: “Good, but nervous but excited too.”
She added: “So nice to see it all coming together and different people along with it.
“All of us are still learning and sharing experiences with each other.
The pair discussed the fact that guests will join afternoon workshops to discuss findings from her project.
Kate said: “I’ve asked everyone to be really honest.”
She added that there needed to be “tangible action”.
Fearne, a champion for Kate’s Shaping Us campaign focusing on the first five years of children’s lives, told her: “I’ve been following what you are doing on your Instagram feed. It’s really built and built, it’s incredible.
Kate replied: “The science is really fascinating it is really,the more you understand the more you learn, more fascinating it becomes, because scientists are always saying we need to get our knowledge, our data translated into public consciousness and real life tangible actions that the families are then going to learn from and sectors of health and educators.”
