After a discussion with Catriona today I feel a bit happier about the direction for my 3rd semester project. For a while it seemed to be moving towards an exploratory kind of research project, where I would open up a range of questions or issues. As we agreed I am a more problem solving oriented person, and so need a project which relates to this. We discussed the possibility of observing how crowds of people behave in somewhere like a train station and so the project summary would be something like:
"Provide train station designers with insights into how to design a station concourse" and these insights would be formed from the observations etc. from my research.
I had a little browse for ideas this evening and came across
The Design Trust for Public Space, who are trying to improve the design of New York's public spaces i.e. streets, plazas, parks and buildings by working with a variety of people. Some of their stuff is really cool and they seem to appreciate the likes of sustainability, innovation and generally making the world a better place.

Their
blog, I (heart) Public Space, has even more information and other ideas around the theme of public space. And what's more they love a bit of ping pong!