While developing your conceptual model, sketch out your object, action, metaphor, and representation ideas. Quickly storyboard your decisions with pencil and paper or on a dry-erase board. This allows you to visually see the result of the decisions you are making.

This is a good time to adjust the model or the representation of it. Take a use case scenario for one of the major tasks in the interface. Apply your objects, actions, and metaphors and representations to the scenario.