(UX does not equal graphic design. Think about _who_ the application is for, the business it enables.)
1. Activity Theory: en.wikipedia.org/wiki/Activity_theory
2. Mental Model: en.wikipedia.org/wiki/Mental_model
Text overview of the graphic:
Personas lead to
Product Features and Principles, which guide
Non-Directed Interviews, which generate
Activity Models, which combine with Personas to build
User Stories.