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Scenario design and stress testing

Scenario design and stress testing construct plausible, severe future conditions to examine how systems and institutions would perform. They complement probabilistic analysis where data are scarce or futures are deeply uncertain. Systemic Risk Management stewards this page for the Nexus Consortium.

02The method

What scenario design and stress testing covers.

  1. 01

    Core methods

    narrative scenario development; reverse stress testing; macro-financial stress testing; multi-hazard scenario construction; tabletop exercises; cascading impact mapping.

  2. 02

    Data and instruments

    historical analogues; model outputs; expert workshops; supervisory scenario frameworks; exposure and balance sheet data.

  3. 03

    Validation

    Scenarios are reviewed for plausibility, internal consistency and severity relative to history. Exercise outcomes are compared with actual events when they occur.

  4. 04

    Limits

    Scenario choice can reflect prevailing assumptions and miss novel combinations. Results depend on how participants and models represent responses.

  5. 05

    Use in risk decisions

    Stress tests reveal vulnerabilities that arise when several risks materialise together. They inform capital, contingency and coordination plans across sectors.

03Reference practice

Scenario and stress testing follow supervisory and planning practice.

ReferenceWhat it sets
NGFS scenariosClimate scenarios for financial analysis
Supervisory stress testingSevere but plausible scenarios
Reverse stress testingScenarios that break a system
04In systemic risk work

Severe, plausible and combined.

Scenarios explore futures that cannot be assigned reliable probabilities. Systemic stress tests combine shocks across systems: a heat wave with a grid failure and a cyber incident. Reverse stress tests start from failure and ask what would cause it.

  • Combine shocks across systems.
  • Use reverse stress tests to find vulnerabilities.
  • Do not present scenarios as forecasts.
  • Applications on Risk Management.
06Stewardship

Who maintains this page.

Systemic Risk Management stewards scenario design and stress testing: it keeps this description current and reviews how the method is applied across the platforms.

07Sources

Where this page's references lead.

The bodies and documents this page is read against. Status and editions change; each link goes to the issuing body.

09Questions

Questions and answers.

Why does one institution host every method page?
GCRI hosts the STEM Commons so that each method has one canonical description. Platforms link to it rather than repeat it, which keeps definitions consistent.
How do I suggest a correction to a method page?
Write to integrity@therisk.global with the passage and the reason.
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