Single point of failure
A component whose failure alone is sufficient to cause a system-level failure, with no redundant path to prevent it. Identifying single points of failure in a safety-critical function is a core reason genuine, justified redundancy is added; the DC-10 cargo door's reliance on a single latch mechanism that could falsely indicate "locked" is a documented example of an unaddressed single point of failure in a safety-critical system. (see Topic 3.4 for the full fault-tree method used to systematically find single points of failure.)
Defined in 5 GAGE programs, which carry 19 distinct definitions of it. The wording above is taught in Engineering Judgment and Professional Formation.
How each discipline defines it
The same term does different work depending on who is using it. These are the definitions as each program teaches them, unedited.
A component whose failure alone is sufficient to cause a system-level failure, with no redundant path to prevent it. Identifying single points of failure in a safety-critical function is a core reason genuine, justified redundancy is added; the DC-10 cargo door's reliance on a single latch mechanism that could falsely indicate "locked" is a documented example of an unaddressed single point of failure in a safety-critical system. (see Topic 3.4 for the full fault-tree method used to systematically find single points of failure.)
A design weakness, named in Section 3J and Section 6, in which a protective process depends entirely on one specific person's availability, so that the process stops functioning reliably whenever that person is absent; addressed in this topic through cross training a second deliverer.
A component whose failure disables the whole system that depends on it. The token-issuing service in a control plane is one, since every agent's short-lived tokens depend on it staying available; this is named explicitly as part of the negative case for centralizing the plane.
The one page in a file that, if proven false, collapses the whole file, usually the necessity case or the data provenance file, since every other claim rests on the system being lawful to run.
The solo-business risk that every workflow depends on one person; mitigated by an honest absence fallback that covers the operator gracefully rather than impersonating them.
Where it is taught
The exact lessons this term appears in. The first module of every program is free with a free account.
- Solo Entrepreneur AI Workflows · Bonus: SMB AI Adoption Path, Certified AI Practitioner: Workplace Foundations
- The Off Switch · Bounding by Design, Certified Agentic AI Governance Professional (CAAGP)
- The Enterprise Control Plane · Rollout, Monitoring, and Incident Response, Certified Agentic AI Governance Professional (CAAGP)
- Continuity When the Model Goes Down · The Money: Budgets, ROI, and Risk, Certified AI Governance Professional (CAIGP)
- Your conformity file under attack: the red team finds what you missed · Adversarial Governance, Certified AI Governance Professional (CAIGP)
- What the judgment layer is and why it runs alongside the technical programs · Your Engineering Judgment Command Center, Engineering Judgment and Professional Formation
- Reasoning from first principles instead of by analogy · Engineering Thinking and Elegant Minimalism, Engineering Judgment and Professional Formation
- Failure-first design: assuming it breaks and planning for it · Engineering Thinking and Elegant Minimalism, Engineering Judgment and Professional Formation
- Thinking in systems, not isolated parts · Engineering Thinking and Elegant Minimalism, Engineering Judgment and Professional Formation
- Simplifying instead of adding: the principle of elegant minimalism · Engineering Thinking and Elegant Minimalism, Engineering Judgment and Professional Formation
Where it shows up at work
A definition is where Single point of failure starts. The lessons above teach it inside the competencies below, which are what job descriptions ask for and what the GAGE credential records. Every link here is drawn from the same careers map that builds a role's readiness check.
Plans for a vendor failure, an unsafe model change or a suspended service: rollback, manual fallback, data export and safe decommissioning.
2 lessons on this page teach it as a primary outcome.
Governs AI agents that take actions: tool access, least privilege, interruptibility, cascading actions and accountability for what an agent did.
One lesson on this page teach it as a primary outcome.
Classifies AI incidents by severity, runs containment, preserves evidence, manages notification, and closes the loop with lessons learned.
One lesson on this page teach it as a primary outcome.
Roles that hire for it
Each role page shows the full competency set, what the seat decides, and a readiness check against your own evidence.
- Chief Information Security Officer, AI security focusneeds it at depth
- AI Incident Response Leadneeds it at depth · 1 open posting this week
- Chief Risk Officer, AI risk editionneeds working knowledge
- AI Security Architectneeds it at depth · 8 open postings this week
- AI Vendor Risk Managerneeds working knowledge
- Third-Party Cyber Risk Managerneeds working knowledge
How job descriptions say it
Postings rarely use the textbook word. These are the phrases the careers map reads as asking for the competencies above.
Where the frameworks place it: DORA; NIS2; NIST AI RMF MANAGE 4; IMDA Model AI Governance Framework for Agentic AI.
One interview question about it
Your AI vendor shuts down next month. What was in your continuity and exit plan, and what did you fail to plan for?
Asked of candidates for ai resilience, continuity and exit planning. Answering it in your own words is exactly how a GAGE topic is passed, and the credential records the pass where an employer can check it.
If you come from another field
Some backgrounds already carry this competency, and the readiness check gives credit for it.
- Cybersecurity and IT carries it as a claim to back up: Continuity and recovery planning are part of the job.
- A cybersecurity or information assurance degree carries it as a claim to back up: Incident response is a course; AI incidents add model failure to the playbook.
Terms it appears with
Not an alphabetical neighbourhood: these are the terms taught in the same lessons, ranked by how often they appear together.