Architecture Is Where Requirements Become a System.

Trace responsibility through every layer.

A conceptual route may pass from user to interface, application, domain or business logic, data, integrations and infrastructure. The exact structure varies by project.

• User
• Interface
• Application
• Business logic
• Data
• Integrations
• Infrastructure

Make boundaries purposeful.

Architecture should express the system’s responsibilities clearly enough to reason about change, validation, access and failure.

• Clarity
• Cohesion
• Traceability
• Change

Separate responsibilities without fragmenting the product.

Components should reflect meaningful behaviours and data ownership, not arbitrary technical fashion.

Know where information comes from and where it goes.

Map capture, validation, storage, transformation, reporting and exchange against business rules and user expectations.

Connect identity to allowed action.

Define who may view, create, change, approve or administer information and how exceptional access is handled.

Treat external capability as conditional.

Every integration depends on external interfaces, permissions, authentication, data quality, limits, terms and availability.

Relate performance expectations to real conditions.

Performance depends on architecture, infrastructure, load, data volume, network conditions and third-party dependencies; it cannot be guaranteed in the abstract.

Confirm where responsibilities begin and end.

Deployment, configuration, monitoring, security, backups, third-party services and operational ownership are agreed per project.