The aggregate of all underpinning conceptual relationships of a user interface defines its structure. [1] UI structure is created when the aggregate of concepts and content is systematically managed to provide a sound reference architecture for UI design, conceptual data models, and technical functionality. [2] 

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.

Before a structure can be systematized, it must be designed. This is often expressed as an  information model. The structural design for a user interface or other shared information environment often includes the consideration of systems for navigation, labeling, search, organization, and semantics. The following is a list of example conceptual models used in the design of UI structures.

• Business & Organizational Models
• Content Models
• Controlled Vocabularies
• Flow Models
• Object Models
• Ontologies
• User Models
• Site Maps
• Taxonomies
• Wireframes