What is UI Structure?
The aggregate of all underpinning conceptual relationships of a user interface defines its structure.  UI structure is created when the aggregate of concepts and content is systematically defined to provide a sound reference architecture for UI design, conceptual data models, and technical functionality. 
UI Structure Contributes to Alignment
UI structure is rooted in information architecture theory and science. It is associated with the following DSIA-based concept, which describes an information architecture (work product) as:
- The assumptions and governing constructs for assigning properties and attributes to information and the endowment and evolution of information relationships over time within a given domain.
- A governing model for information behavior within a digitally mediated environment.
- The governing framework for content behavior.
These descriptions provide an important lens that gives focus to the UI engineering activities needed in the design of complex digital user interfaces. As a result, UI structure helps to align a range of digital disciplines, including but not limited to:
- Experience & Interaction Design
- Content Strategy & Publishing
- Design Systems & Accessibility
- Navigation, Labeling, Search, and Organization Systems
- Product & Business Architecture
- Data Architecture