“A product architecture is not an information architecture. It is not a set of pages that link to one another, or something that shows modals and describes what buttons do. A prototype will always serve this purpose better. It is a level deeper than that. It is the structure. The building blocks. It shows the objects in the system, and the relationships between them.”
The Dribbblisation of design
How the logical, mental and virtual structures come together in an app.