Fujitsu gave us a pitch brief in the form of a riddle. No business requirements, no constraints (other than a 72 hour timeframe). Just simply a GUI based on a hierarchical set of nested data labeled as 1, 1.1, 1.2, 1.3, 2, 2.1, 2.2, 2.3, etc. Simple, right?
We started with some blank sheets of paper.
And let the UI unfold.