Cascading Failure Containment for System of Systems

Structural Problem

Modern infrastructure consists of coupled systems-of-systems where platforms, services, and subsystems interact across organizational and technical boundaries. The structural problem is that these coupling paths create failure propagation channels that cross system boundaries — a failure in one platform can cascade through API dependencies, shared infrastructure, or data flows to destabilize systems that appear architecturally independent.

Containment — limiting the blast radius of failures — requires understanding the full coupling topology across the system-of-systems, including coupling paths that exist through shared infrastructure, common mode dependencies, and transitive API chains that are not visible in any single system's architecture documentation.

System Context

This application addresses environments where multiple platforms or systems interact to form a coupled composite — cloud provider ecosystems, enterprise platform landscapes, critical infrastructure networks, and federated service architectures. The relevant system boundary spans the entire system-of-systems, including cross-system dependencies, shared infrastructure, and organizational boundaries.

Diagnostic Capability

• Cross-system propagation path analysis identifying coupling channels through which failures can cascade across system boundaries
• Blast radius prediction mapping the maximum failure extent for specific failure scenarios across the system-of-systems
• Containment boundary validation assessing whether architectural isolation boundaries actually prevent cross-system cascade
• Common mode dependency detection identifying shared infrastructure or services that create hidden coupling between systems

Typical Failure Modes

• API cascade where a service failure propagates through API dependency chains across multiple platforms
• Shared infrastructure coupling where systems that appear independent share underlying infrastructure whose failure affects both
• Data flow contamination where corrupted data from one system propagates through data integration channels to downstream systems
• Organizational boundary breach where a failure crosses the boundary between independently managed systems through unrecognized coupling

Example Use Cases

• Platform landscape risk assessment: Structural mapping of cascade paths across an organization's platform ecosystem
• Vendor dependency analysis: Identifying cascading failure risks through external vendor dependencies
• Resilience architecture validation: Verifying that architectural isolation boundaries contain failures as designed

Strategic Relevance

System-of-systems failures represent the highest-impact incidents in modern infrastructure — they affect multiple services, teams, and potentially customers simultaneously. Structural containment analysis is the only way to predict and prevent cascade failures that cross architectural and organizational boundaries.

SORT Structural Lens

The SORT framework addresses this application through four structural dimensions, each providing a distinct analytical layer.