Design Cycle
Stanford D School "Design Thinking" model
When using any Design Thinking Model, they key is Empathy, Empathy, Empathy. Always come back to Empathy- What does your end-user think, need or want?

Thinking Protocol
Observe Closely - describe what's there
Building Explanations
Reasoning
Making Connections
Consider Different Viewpoints and Perspectives
Uncovering Complexity and Going Below the Surface