Design is the critical step that identifies the user objects, actions, and metaphors that should be portrayed in the interface so that users can understand the interface and learn to use it effectively to accomplish their goals. The translation of this conceptual design into graphical user interface objects is accomplished later in this interface design phase when you create a design mockup, and during the construction phase when you develop a computer prototype.

Here are the 6 steps involved in the design phase:

1. Choose Major User Objects
2. Metaphors & Representations
3. Storyboard
4. Create HL Interface Design
5. Test
6. Develop Support Plan