Here's the short version:
UX/IA: How it works, what it does, for who, and why
- What are the business goals?
- What do users need?
- How do I work this?
User research + Personas + Narratives = Requirements
Requirements + Interactions + Look and feel = UI
Facilitation: Asking the questions whose answers are the roadmap.
Evaluation: Testing concepts and prototypes with the target audience.
Ideation and Creation: User flows, sketches and wireframes to document the customer journey with iterative steps that define, test and improve solutions against requirements so that it's more likely to be built right.
Example of how *not* to do UX: