We certainly know what the barriers are in the early stages. The lack of role models in a very male-dominated classroom and program environment is a factor, but this is something that cannot be dealt with by a single player. For instance, at the federal-provincial-territorial table, there have been discussions on this issue. There's a continued interest in working together to address this in a more holistic manner.
But you're quite correct. There are certain barriers that appear very early in the life of a young girl that discourage her from those types of career choices.