The principle
Enterprise architecture is object-oriented thinking at institutional scale
A well-designed service exposes what others need while protecting the complexity of how it fulfils its responsibility. Business Applications should not become identity providers, notification gateways, payment orchestrators, and support systems at the same time.
The contract
Rights, responsibilities, and trust
- Every service owns a defined outcome
- Every caller is identified and authorized
- Internal complexity remains encapsulated
- Contracts are stable, versioned, and observable
- Data exposure is minimized to purpose
The result
Change becomes localized
A provider, channel, or policy can evolve inside its responsible service while Business Applications retain their mission.