Designing interactive experiences is a 4-dimensional. multilayered process. In his book “Elements of User Design” Jesse James Garrett has a useful model for framing the user design problem that we call “The Parking Deck”. It is design framework that organizes the user experience design problem into “tiers”, each of which serves as the foundation for the next tier above. The lower the tier the broader and more critical the design issues.
The Parking Deck