Skip to content

GRF · Foresight Nexus

Strategic scenarios

Scenarios are structured descriptions of plausible alternative futures, built so that an institution can test its strategy against conditions it does not expect. They are not forecasts and carry no probability. Their worth lies in widening the range of futures that decision-makers take seriously, exposing hidden assumptions and preparing options in advance. This page sets out how scenario work is designed, how it succeeds or fails inside institutions, and who uses it.

01Register

Strategic scenarios on the record.

02The question

Strategic scenarios: how the risk develops.

Plausible alternative futures. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Mechanism

Drivers and critical uncertainties

Scenario design starts by separating predetermined elements, such as cohorts already born, from critical uncertainties whose direction is open and whose impact is large. The choice of uncertainties shapes everything that follows, so it is documented and challenged.

Mechanism

Divergent, consistent futures

Each scenario follows a coherent logic from today to the horizon. Consistency checks remove combinations that cannot coexist; divergence ensures the set spans futures that would call for different responses.

Mechanism

Testing strategy, not choosing a future

Policies and plans are wind-tunnelled against every scenario. A strategy that works in only one future is fragile; one that holds across the set, or can be adapted in time, is robust.

Mechanism

Capture and fatigue

Scenarios fail when they are written to confirm an agreed plan, when a preferred scenario quietly becomes the forecast, or when the set is never refreshed. Ownership by a decision-holder and a review schedule keep them in use.

03Geography

Hazards and exposure in the Arctic.

Daytime surface heat, population density and rain over the Arctic, from NASA GIBS. Each layer carries its own date.

The interactive map needs JavaScript; the layer list and sources are below.

Layers 3

Hazards and exposure, for this page

About this layer
Evidence
Observed (persistent cloud still leaves gaps)
Source
VIIRS NOAA-20 Level 3, 8-day (NASA LANCE)
Provider
NASA LANCE
Licence
NASA open data
Vintage
8-day; Satellite 8-day composite; persistent cloud still leaves gaps
Newest at build
2026-09-14
Resolution
about 1 km grid
Uncertainty
Satellite skin temperature of the ground over the 8 days ending on the date shown, a heat exposure indicator; not air temperature, heat index or a heat warning.
Reached through
gibs.earthdata.nasa.gov, only after you allow the live map
About this layer
Evidence
Estimated
Source
Gridded Population of the World v4.11 (NASA SEDAC (CIESIN, Columbia University))
Provider
NASA SEDAC (CIESIN, Columbia University)
Licence
CC BY 4.0
Vintage
null; Census-based estimate, static (2020)
Resolution
about 1 km grid
Uncertainty
Census-based estimate of people per square kilometre in 2020, shown as exposure context; not a count of people affected by any hazard.
Reached through
gibs.earthdata.nasa.gov, only after you allow the live map
About this layer
Evidence
Estimated
Source
GPM IMERG (NASA GES DISC)
Provider
NASA GES DISC
Licence
NASA open data
Vintage
daily; Satellite estimate, near real time
Newest at build
2026-10-12
Resolution
about 2 km grid
Uncertainty
Satellite estimate, near real time. Satellite or model raster as the provider publishes it. Clouds, swath gaps and retrieval error leave gaps and noise; values are indicators, not measurements at a place.
Reached through
gibs.earthdata.nasa.gov, only after you allow the live map
About this layer
Evidence
Observed (clouds leave gaps)
Source
VIIRS Global Flood Product (NASA LANCE)
Provider
NASA LANCE
Licence
NASA open data
Vintage
daily; Satellite detection; clouds leave gaps
Newest at build
2026-10-14
Resolution
about 250 m grid
Uncertainty
Satellite detection; clouds leave gaps. Satellite or model raster as the provider publishes it. Clouds, swath gaps and retrieval error leave gaps and noise; values are indicators, not measurements at a place.
Reached through
gibs.earthdata.nasa.gov, only after you allow the live map
About this layer
Evidence
Observed (clouds and overpass timing leave gaps)
Source
VIIRS NOAA-20 375 m (FIRMS) (NASA LANCE FIRMS)
Provider
NASA LANCE FIRMS
Licence
NASA open data
Vintage
daily; Satellite detection; clouds and overpass timing leave gaps
Newest at build
2026-10-13
Resolution
about 500 m grid
Uncertainty
Satellite hot-spot detections for the day shown, including gas flares and industrial heat; not a confirmed fire, an incident report or a warning.
Reached through
gibs.earthdata.nasa.gov, only after you allow the live map
About this layer
Evidence
Observed
Source
GHRSST MUR25 (NASA JPL PO.DAAC)
Provider
NASA JPL PO.DAAC
Licence
NASA open data
Vintage
daily; Satellite analysis
Newest at build
2026-10-12
Resolution
about 2 km grid
Uncertainty
Satellite analysis of how far sea temperature departs from its usual value for the date shown; a marine heat indicator, not a coral bleaching alert.
Reached through
gibs.earthdata.nasa.gov, only after you allow the live map

Latest available

NASA GIBS / EOSDIS · ASTER GDEM (METI, NASA) · Blue Marble (NASA) · © OpenStreetMap contributors (ODbL) · Natural Earth

Loading the latest NASA imagery.

Drag to move. Ctrl or ⌘ and scroll, pinch or the buttons to zoom; hover for the values under the pointer; reset returns to the region.

Hazards and exposure, framed on the Arctic.Satellite and model products as NASA publishes them, each with its own date. They are indicators, not assessments of any place.

Data: NASA GIBS · ASTER GDEM · Blue Marble · © OpenStreetMap contributors · Natural Earth · NASA EONET · U.S. Geological Survey · NASA GPM IMERG EarlySources and licences

  • We acknowledge the use of imagery provided by services from NASA’s Global Imagery Browse Services (GIBS), part of NASA’s Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • We acknowledge the use of imagery provided by services from NASA’s Global Imagery Browse Services (GIBS), part of NASA’s Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • VIIRS near-real-time products (flood, land surface temperature, snow cover, corrected reflectance), NASA LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • Center for International Earth Science Information Network (CIESIN), Columbia University. 2018. Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11. NASA Socioeconomic Data and Applications Center (SEDAC). Licensed under CC BY 4.0. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). doi:10.7927/H49C6VHW. CC BY 4.0
  • GPM IMERG precipitation, NASA Precipitation Processing System; distributed by the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • NASA Fire Information for Resource Management System (FIRMS), VIIRS 375 m active fire product, NASA LANCE; vector tiles via NASA GIBS. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • GHRSST Level 4 MUR analyses, NASA Jet Propulsion Laboratory; distributed by the NASA Physical Oceanography DAAC (PO.DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • ASTER GDEM is a product of METI and NASA (ASTER Global Digital Elevation Model V003, NASA LP DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). Cite as: NASA/METI/AIST/Japan Spacesystems and U.S./Japan ASTER Science Team (2019). ASTER Global Digital Elevation Model V003. doi:10.5067/ASTER/ASTGTM.003. NASA open data
  • Made with Natural Earth. Free vector and raster map data @ naturalearthdata.com. Public domain
  • © OpenStreetMap contributors (ODbL), via NASA GIBS (coastlines, boundaries, roads and place names). Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). ODbL
  • Blue Marble, NASA Earth Observatory; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into hexagonal cells where shown (modified). NASA open data
  • Context on the globe and flat map: coastlines, boundaries, roads and place names from NASA GIBS reference layers (OpenStreetMap data, ODbL, © OpenStreetMap contributors); Blue Marble imagery as an optional base; 3D terrain and the elevation read-out from the ASTER GDEM elevation colour index (5 m to 200 m classes, exaggerated for legibility). Boundaries are drawn as published and imply no position on any territory.
  • Live events: NASA Earth Observatory Natural Event Tracker (EONET); events are indicative and keep their original source links.
  • Live: NASA EONET Events are indicative, not authority warnings.
  • Live: U.S. Geological Survey Events are indicative, not authority warnings.
  • Live: NASA GPM IMERG Early. We acknowledge the use of imagery provided by services from NASA’s Global Imagery Browse Services (GIBS), part of NASA’s Earth Science Data and Information System (ESDIS).
  • NASA GIBS: We acknowledge the use of imagery provided by services from NASA’s Global Imagery Browse Services (GIBS), part of NASA’s Earth Science Data and Information System (ESDIS).
  • River discharge forecast, 30 days with range (GloFAS via Open-Meteo): Contains modified Copernicus Emergency Management Service information 2026; not a flood warning.
  • Weather data by Open-Meteo.com (https://open-meteo.com/), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
  • Optional layers (11 sources in the layer list: live, forecast, observed and context) print their provider credit on the map and here when switched on; forecasts are model output and derived indices are estimates.

Layers and dates

  • Land surface temperature, day, 8-day composite: VIIRS NOAA-20 Level 3, 8-day, NASA LANCE · 14 Sep 2026
  • Population density, 2020: Population: CIESIN, Columbia University, Gridded Population of the World v4.11 (2018), NASA SEDAC, CC BY 4.0 · static
  • Precipitation rate, daily mean: GPM IMERG, NASA GES DISC · 12 Oct 2026
  • Flood water, 3-day composite: VIIRS Global Flood Product, NASA LANCE · 14 Oct 2026
  • Active fires and thermal anomalies: VIIRS NOAA-20 375 m (FIRMS), NASA LANCE FIRMS · 13 Oct 2026
  • Sea surface temperature anomaly: GHRSST MUR25, NASA JPL PO.DAAC · 12 Oct 2026

04Indicators

What is measured, and how well.

Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.

IndicatorUnitCadenceSource typeLabel
Scenario sets in current use by governmentcount of published setsannualPublished foresight reportsPublished statistics
Policies and strategies tested against a scenario setcount per planning cycleper cycleCabinet and ministry planning recordsPublished statistics
Interval between scenario refreshesmonthsper setPublication recordPublished statistics
Participant range in scenario exercisespersons by sector, region and age groupper exerciseWorkshop recordsREPORTED
Signposts tracked against each scenariocount of signpostsquarterlySignpost registerREPORTED
Strategies citing scenario evidenceshare of strategy documentsannualDocument analysisESTIMATED
05Monitor

Policy wind tunnel.

The screen a team would use to follow this subject: its measures, states and decisions. Names are examples and values are illustrative.

Policy wind tunnel

Strategic scenarios · Scenario set B · Policy: POL-56

Fails in one scenarioGRF · Foresight Nexus

Policy performance by scenario

0 fails to 100 robust

Higher is more robust. Example scores.

Signposts to monitor

  1. S-1Trade restrictions on inputstriggers adaptation 2quarterly
  2. S-2Cost of sensorstriggers scale-upannual
Policy wind tunnel: the screen’s structure, terms and states for Strategic scenarios.Example names and illustrative values; a design, not a record or a live system.
06Sources

Where the evidence comes from.

Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.

SourceWhat it givesLicence class
IPCC AR6 Scenario Database (hosted by IIASA)Quantified emissions, energy and land pathways from integrated assessment models assessed by the IPCCFree with attribution, database licence terms
SSP Database (IIASA)Population, urbanisation and economic projections for each shared socioeconomic pathwayFree with registration, IIASA terms
IEA World Energy Outlook scenariosStated policies, announced pledges and net zero pathways for energy supply and demandIEA terms, part free and part licensed
NGFS climate scenariosTransition and physical risk scenarios used by central banks and supervisorsFree with attribution
US National Intelligence Council Global TrendsLong-range scenarios on global structural forces, published each presidential termPublic domain, US government work
UK Ministry of Defence Global Strategic TrendsLong-horizon trend analysis and alternative futures for defence and security planningOpen Government Licence
07Policy scenarios

Compare instruments: rules, incentives and information.

Three families of instruments side by side against the baseline, each with its own lag and adoption speed, under the coverage and compliance you set; effect sizes are teaching values to replace with evidence. Scenario: named assumptions about the future, not a forecast. The map on this page shows The Arctic; the model itself is not tied to a place.

Controls

Baseline trend of the outcome
2.0% a year
Coverage of the instrument
70%
Compliance
75%
Effect size, against the teaching value
100%
Years ahead
20 years

Readouts

Largest reduction at the horizon
Regulation
Its reduction against the baseline
21%
Numbers, methods and sources
YearBaselineRegulationEconomic incentiveInformation and capacity
0100.099.598.899.1
1102.0101.2100.199.8
2104.0102.5101.199.9
3106.1103.5101.6100.0
4108.2103.7101.8100.7
5110.4103.2101.7102.1
6112.6102.0101.6103.9
7114.9100.4101.6105.9
8117.299.2102.1108.0
9119.598.6102.9110.1
10121.998.9104.2112.3
11124.399.7105.7114.5
12126.8101.1107.4116.8
13129.4102.7109.4119.2
14131.9104.5111.4121.6
15134.6106.5113.5124.0
16137.3108.5115.7126.5
17140.0110.7118.0129.0
18142.8112.9120.4131.6
19145.7115.1122.8134.2
20148.6117.4125.2136.9

Methods

  1. Tools of government Hood (1983), The Tools of Government, Macmillan
  2. Carrots, sticks and sermons Bemelmans-Videc, Rist and Vedung (1998), Transaction
  3. Diffusion of innovations Rogers (2003), Diffusion of Innovations, Free Press
  4. Uncertainty fan (parameter Monte Carlo) Spiegelhalter, Pearson and Short (2011), Visualising uncertainty about the future, Science 333
  5. One-at-a-time sensitivity (tornado) Saltelli and others (2008), Global Sensitivity Analysis: The Primer, Wiley

Data

The model runs on the teaching values set by the controls. To calibrate it for a place, read it against these admitted layers and series, which this page’s map can draw:

  • Borders Natural Earth
  • Cities Natural Earth
Compare instruments: rules, incentives and information. Illustrative teaching model: it runs on the values set by the controls, not on measured data. Methods: Tools of government (Hood (1983), The Tools of Government, Macmillan); Carrots, sticks and sermons (Bemelmans-Videc, Rist and Vedung (1998), Transaction); Diffusion of innovations (Rogers (2003), Diffusion of Innovations, Free Press).

Across the six pillars, led by Nexus Consortium

08Decisions

Who decides, and what the evidence serves.

Foresight Nexus prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Who decidesThe questionEvidence this page serves
Cabinet offices and prime ministers’ strategy unitsWhether a national strategy holds across plausible futures, or needs contingent optionsScenario sets with their uncertainties and assumptions, wind-tunnel results and the signposts to watch
Central banks and prudential supervisorsWhich climate and macro-financial scenarios to use in supervisory exercisesScenario narratives, their parameter choices and their coverage of severe but plausible conditions
Ministries of defence and foreign affairsWhich capabilities and partnerships remain sound across alternative security environmentsAlternative futures with the drivers that separate them and the institutional responses each calls for
Energy ministries and system operatorsWhich investments hold across energy transition pathwaysPublished pathways compared on demand, technology and policy assumptions

Outputs this topic produces

  • Foresight outlooks with scenario sets, drivers and assumptions stated
  • Scenario learning protocols for workshops and policy wind-tunnelling
  • Signpost registers that track which scenario conditions are emerging
  • Comparisons of scenario sets published by different institutions
09Implementation

From mandate to evaluation, by pillar.

The steps an instrument takes from mandate to evaluation, each with the pillar that runs it, and the decisions that stay with the authority. Teaching model with stated illustrative values, not a prediction. The map on this page shows The Arctic; the model itself is not tied to a place.

  1. Mandate and problem framing Competent authority (outside the programme)
    A competent authority frames the problem and the mandate under its own rules. Howlett, Ramesh and Perl (2009)
  2. Evidence and system model Foundry
    The system is modelled with its feedbacks, data and stated limits. OECD (2014), principle 2
  3. Options appraised with scenarios Foundry
    Instruments are compared under scenarios, with uncertainty shown. Hood (1983)
  4. Exercise with stakeholders Universe
    The options are tested in an exercise with those who would implement and bear them. OECD (2014), principle 3
  5. Standard or guidance drafted Nexus Standards
    What works is codified as a standard or guidance, open to comment. Nexus Standards process
  6. Decision by the authority Competent authority (outside the programme)
    The authority decides, outside the programme, with the evidence on record. Howlett, Ramesh and Perl (2009)
  7. Capacity and training Risk Academy
    Those who implement are trained on the decided instrument and its data. Sendai Framework (2015), priority 2
  8. Monitoring and public report Reports
    Indicators are published with sources, limits and corrections. OECD (2014), principle 5
  9. Evaluation and revision Nexus Standards
    Results return to the standard and the model: the cycle closes. Howlett, Ramesh and Perl (2009)

Methods

  1. Policy cycle Howlett, Ramesh and Perl (2009), Studying Public Policy, Oxford University Press
  2. Governance of critical risks OECD (2014), Recommendation of the Council on the Governance of Critical Risks
  3. Layered drawing of directed graphs Sugiyama, Tagawa and Toda (1981), IEEE SMC 11
From mandate to evaluation, by pillar: the steps as recorded, each with its pillar; sources as cited on each step.

Across the six pillars, led by Nexus Consortium

10Core questions

What practitioners ask.

  • Which driving forces are both highly uncertain and highly important for the question at hand?
  • How many scenarios are useful, and how different should they be?
  • How can scenarios include surprises and discontinuities without becoming implausible?
  • How should quantitative models and qualitative narratives be combined?
  • How can scenarios be used to test strategies rather than simply describe futures?
11Twin and cascade simulator

Exercise a cascade in strategic scenarios with the people who decide.

Assembled from the Nexus Standards area profile Future generations and long-term risk: the hazards it names, the systems and communities that carry the loss, the controls and institutions that dampen it and the data that observe it. Pick an initiating event and step through the cascade to see where mandates meet and which decisions fall to whom. The Map view places the run on an example geography with open data. Every weight is a stated assumption. An exercise for dialogue, not a forecast, an assessment or a position. To model a place of your own choosing, open the full System Builder.

Hazards

  • Nuclear war
  • Dam failure
  • Financial contagion
  • Cryptographically relevant quantum computer
  • River flood (set off downstream)
  • Flash flood (set off downstream)
  • Mass displacement (set off downstream)
  • Nuclear detonation (set off downstream)
  • Health-system overload (set off downstream)
  • Data breach (set off downstream)
  • Mass account takeover (set off downstream)
  • Harvest-now, decrypt-later collection (set off downstream)
  • Widespread power outage (set off downstream)
  • Water supply shortfall (set off downstream)
  • Sovereign debt crisis (set off downstream)
  • Currency crisis (set off downstream)
  • Nuclear winter (set off downstream)
  • High-altitude electromagnetic pulse (set off downstream)

Controls

  • NS-0 Constitution and principles
  • NS-9 Contextual UNIs (deployments, instances, programme instances)
  • NS-10 Policies and clauses (machine-readable obligations: definition, binding, evaluation and enforcement)
  • NS-11 Verification and monitoring (evidence, attestations, zero-trust conformance observation)
  • NS-13 Standards development process (open proposals, review, versioning, adoption)
  • NRS-U12 Universe platform profile: Foresight Nexus
  • NRS-H26 Hazard family: Land and wetland degradation (NHS-1 eco.land)
  • NRS-H92 Hazard family: Ageing and degraded infrastructure (NHS-1 infra.ageing)
  • NRS-P4 Foresight, horizon scanning and strategy
  • NRS-H11 Hazard family: Coastal and sea-level hazards (NHS-1 water.coastal)
  • NRS-H31 Hazard family: Persistent and bioaccumulative substances (NHS-1 poll.persistent)

Observation

  • Our World in Data datasets (listed for reference)
  • CMIP6 climate projections (Copernicus Climate Data Store) (listed for reference)
  • World Bank Open Data and World Development Indicators API (listed for reference)
  • Number of countries with mechanisms in place to enhance policy coherence of sustainable development

Example geography

  • Bangladesh: 134 hexagonal cells
  • Night lights tonight, outages (VIIRS Day/Night Band), NASA GIBS
  • Surface water through cloud, 30 m (OPERA DSWx-S1 radar), NASA GIBS
  • Rain rate, last half hour (IMERG), NASA GIBS
  • Surface soil moisture (SMAP), NASA GIBS
12Mechanisms

Drivers and dynamics.

Scenario practice has deep roots in military planning and corporate strategy, where it helped organisations prepare for shocks that conventional forecasts missed. A common approach identifies the critical uncertainties, the forces that matter most and are least predictable, and builds contrasting futures around them. Other approaches start from a desired or feared end state and work backwards, or develop scenarios through participatory processes with stakeholders.

Scenarios change decisions when they are developed with the people who will use them, when they are challenging but plausible, and when they are used to test specific strategies. They fail when they are too close to the planning baseline an institution already uses, when one scenario is treated as the preferred future, or when they are produced by outsiders and handed over without engagement.

Why now: institutions face compound shocks that single forecasts did not anticipate, and scenario sets are increasingly used to test strategies. Foresight Nexus builds scenario sets with the people who will use them, and those scenarios set the conditions for Universe exercises, always labelled as scenarios.

13Instruments and commitments

How strategic scenarios is governed: instruments, mandates and commitments.

The instruments, mandates, actors and accountability arrangements a policymaker, diplomat or development agency works with, citing the agreements that set them. Structures follow the frameworks named. Any state or progress drawn is illustrative, not a record.

Policy instrument matrix

The kinds of instrument available on strategic scenarios, by level of government and cooperation.

Instrument typeLocalNationalRegionalGlobal
RegulatoryZoning, building codesLaws, standards, licensingHarmonised rulesConventions and treaties
EconomicLocal levies, grantsBudget lines, taxes, insurance schemesRisk pools, regional fundsFinancing mechanisms
InformationLocal warningsDisclosure, early warning, statisticsData sharing arrangementsGlobal monitoring and reporting
InstitutionalLocal committeesLead agencies, coordination councilsRegional bodies and secretariatsMultilateral mandates
CooperativeCommunity agreementsPartnership compactsMemoranda and joint programmesAgreements and joint commitments
A typology after the OECD Recommendation on the Governance of Critical Risks; examples of instrument types, not an inventory of any country’s measures.
Sendai Framework for Disaster Risk Reduction · UNDRRParis Agreement · UNFCCC2030 Agenda and the Sustainable Development Goals · United NationsInternational Health Regulations · WHO
14Methods and limits

How it is approached.

  1. 01

    Driver analysis

    Structured identification of forces, ranked by importance and uncertainty.

  2. 02

    Narrative development

    Coherent, internally consistent stories that describe how each future could emerge.

  3. 03

    Quantified scenarios

    Models from scenario design and stress testing and complex systems and agent-based modelling add consistency and scale where data allows.

  4. 04

    Limits

    Scenarios reflect the imagination and biases of those who build them, cannot be validated in advance, and can be misread as forecasts if not carefully labelled.

15Methods

How it is studied, and what the methods cannot say.

  1. Scenario design and stress testingExploratory scenario development · Policy wind-tunnellingApplied here
  2. Decision analysis under uncertaintyRobust decision making · Dynamic adaptive policy pathways · Structured expert elicitationApplied here
  3. Complex systems and agent-based modellingSystems mapping of drivers · Agent-based exploration of social changeApplied here
  4. Forecasting and time-series analysisAggregated judgemental forecasting · Probabilistic population projectionsApplied here
17Questions

Questions and answers.

Why do scenarios not say which future is most likely?
Because their purpose is to test decisions against a range of futures, not to bet on one. Assigning probabilities invites planners to prepare for the likeliest case and ignore the rest, which is the failure scenarios exist to prevent.
How many scenarios should a set contain?
Practice commonly uses three or four: enough to span distinct futures, few enough to hold in mind. Sets built as a central case with variants tend to collapse into a forecast with sensitivities.
What is wind-tunnelling?
Testing an existing or proposed policy against each scenario in turn, asking whether it still achieves its aims and what would need to change. It turns scenarios from narratives into a check on strategy.
Are climate pathways the same as strategic scenarios?
They share methods but differ in purpose. Climate pathways quantify emissions and impacts for assessment; strategic scenarios explore the wider conditions an institution may face. Many exercises now combine both.
Why not just pick the most likely scenario?
Because scenarios are designed to test strategies across different futures. Choosing one defeats their purpose.
Are scenarios the same as stress tests?
They are related. A stress test applies a severe scenario to a system to see how it performs; scenarios more broadly explore how the future could unfold.
How many scenarios should there be?
Often three or four, enough to show real differences without overwhelming users, but practice varies with purpose.
Who reviews coverage of this topic?
Published analysis is designed to be reviewed by a named subject reviewer, to cite its references and to include independent specialist voices. Where specialists disagree, the disagreement is reported rather than resolved by omission.
ReportsContribute

Contribute evidence from this page.

Reports is the Consortium’s quarterly publication. What you know about this subject can become evidence, a case or a correction in the next edition, credited to you and published under CC BY 4.0 where it is your own work.

Global Risks ForumForesight NexusForesight OutlookScenario and Stress-Test
Foresight Nexus

Bring a governance question to the Forum.

Information and enquiries are open today. An enquiry receives a reference and names the next step; applications, payments, compute allocations and registrations open only when their team, terms and review capacity exist.