User roles and permission matrix (admin, editor, viewer)

Task flows for key jobs (managing users, viewing reports, exporting data)

Information architecture and navigation model

Wireframes for data-heavy screens

High-fidelity screens: overview dashboard, tables, detail views, settings, forms

Data visualization guidelines (chart types, colors, legends, tooltips)

Table patterns: sorting, filtering, search, pagination, bulk actions

Full state coverage: empty, loading, error, no-permission, success

Notifications, alerts, and confirmation dialogs

Light and dark themes

Responsive behavior for tablet, or a clear "desktop only" decision

Scalable design system with tokens and documentation

Handoff specs with data-format assumptions