While the structure defines the way in which features and functions fit together, what those features and functions constitute are the scope of the site. This includes functional specifications and content requirements of your app.
Functional specifications are detailed descriptions of the functionality of your app. Content requirement refers to the content elements required in your app to meet your users’ needs. These may evolve during your process, based on user testing and feedback.
The Flâneur approach to user experience design.
Storytelling.
User stories.