After carrying out a large scale brainstorming session with every group, we stopped brainstorming for a while and made a functional analysis, which should have been the first thing to do. Following the functional analysis, the 'shelter' function was broken down into three main sub-functions,
1. Protection from the environment.
2. Making people feel comfortable inside
3. Integration with the environment.
We then broke down the sub-functions in order to better understand every dimension of the problems we had to solve.