One design model I've always liked is Prof Bob Stone's "3 fidelities" for designing immersive 3D/VR experiences. The three fidelities are:
- Context/Environment Fidelity - how well do the surroundings model the real environment and context - but more is not necessarily better;
- Task Fidelity - how well to the sequence of actions (and their consequences) model the real task;
- Interaction Fidelity - how well do the manipulation and haptics mirror those experienced in real life.
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