Service Modularity & Autonomy Requirements
Purpose
To enable products to operate independently, minimize cascading failures, and support flexible deployment models by ensuring clear boundaries, self-contained logic, and runtime autonomy.
Scope
Domain boundaries, business logic ownership, runtime independence, startup/shutdown behaviour, dependency management, and failure isolation.
Requirements
| ID | Name | Description |
|---|---|---|
| REQ-MOD-1 | Clear Product Scope | Each product MUST have a clearly defined scope aligned to a specific business function or value stream, with unambiguous ownership and success metrics. |
| REQ-MOD-2 | Domain-Aligned Model | A product’s domain model and terminology MUST mirror the business language of its domain and MUST NOT mix unrelated concepts from other domains. |
| REQ-MOD-3 | Self-Contained Business Logic | Core business rules and decision logic MUST reside within the owning product and MUST NOT depend on external products to make domain decisions. |
| REQ-MOD-4 | Independent Startup | Products MUST be able to start, run, and be deployed without requiring other products to be up or reachable, beyond explicitly declared optional integrations. |
| REQ-MOD-5 | Graceful Degradation | When dependencies are unavailable or misbehaving, products MUST degrade by disabling affected features while keeping core capabilities operational and stable. |
| REQ-MOD-6 | No Hidden Dependencies | Products MUST avoid hidden runtime or deployment ordering constraints; any ordering requirements MUST be minimised and explicitly documented. |
| REQ-MOD-7 | Minimal Coupling | Module boundaries MUST minimise coupling and maximise cohesion, avoiding “god” services and cross-cutting logic scattered across multiple products. |
Reference Template
TBD — a reference example for this standard is pending (to be crafted).