REAL-WORLD INTERPRETIVE

WORLD EVENT LITERACY

Probability Bands, Consequence Magnitude, and Non-Additivity

Interpret source-authored annual probability, consequence magnitude, weighted score, and planning priority without converting them into calibrated forecasts or site rankings.

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REAL-WORLD INTERPRETIVE Editorial synthesis or explanation derived from sources and explicitly open to correction.

Confidence: Source-bounded
Sources: 1
Independent corroboration: 0
Jurisdiction: Global / scenario-dependent
Date range: Historical cutoff 2026-07-24; fictional scenario horizon 2027–2036
Review: Repository-authored WIP.30 transformation — exact workbook bytes verified; baseline sources, scenario assumptions, probabilities, consequences, accessibility, legal, historical, technical, cultural, affected-community, and specialist review pending

Estimated reading: 14 minutes
Review date: 2026-07-24
Stable route: /international/event-literacy/probability-bands-consequence-magnitude-and-non-additivity

Source boundary · evidence boundary

The supplied workbook is preserved exactly, but preservation does not authenticate its authorship, currentness, baseline sources, historical claims, scenario assumptions, numerical estimates, or consequences. The public transformation uses these exact labels: HISTORICAL RECORD ENDS AT 2026-07-24; FICTIONAL SCENARIO — NOT HISTORICAL, NOT A FORECAST; SOURCE-AUTHORED ANALYTICAL ESTIMATE — NOT CALIBRATED OR ADDITIVE; and ILLUSTRATIVE CONSEQUENCE PATH — NOT A PREDICTION. Rows are overlapping planning cases, coordinates are broad centroids rather than target locations, and no row authorizes real-world action.

LEVEL 1

ORIENTATION

Why this matters

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One-sentence brief

Numerical precision can create false confidence. The workbook’s formulas are useful only when their assumptions and limits remain visible.

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Three key points

Probability is an approximate source-authored annual estimate.
Magnitude describes strategic scale, not moral value.
Weighted score and priority are comparison aids, and overlapping probabilities must never be summed.

LEVEL 2

WORKING BRIEF

Evidence, context, and limits

REAL-WORLD INTERPRETIVE

Approximate annual probability

The workbook assigns a percentage to each annualized scenario. It explicitly says the values are analytical judgments rather than statistically calibrated forecasts.

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Probability bands

Remote is below 5%; Low is 5% to below 15%; Moderate is 15% to below 30%; Elevated is 30% to below 50%; High is 50% or above. A band is a workbook classification, not independent validation.

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Consequence magnitude

Magnitude ranges from 1 to 5 and describes strategic scale. A beneficial scientific or governance breakthrough can receive magnitude 5 because its effects are large.

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Weighted score

The workbook calculates probability divided by 100, multiplied by magnitude and 20. The 0–100 result is not expected casualties, financial loss, welfare, or social value.

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Planning priority

Priority is a source formula intended to preserve attention to some low-frequency, high-consequence cases. It is not a site ranking, publication order, or authorization signal.

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Why probabilities do not add

Scenario families overlap, share causes, and may describe alternative manifestations of one structural risk. Adding their probabilities would double-count assumptions and produce a meaningless total.

LEVEL 3

COMPLETE DOSSIER

Limitations, game links, and review context

DISPUTED / MULTIPLE ACCOUNTS

Known limitations and gaps

The workbook is a user-supplied research and scenario-planning input, not an authenticated forecast or intelligence product.
Probability values are source-authored approximate annual estimates and have not been independently calibrated.
Scenario families overlap and their counts or probabilities must not be added.
Consequence paths are illustrative, not predicted outcomes.
The site provides no operational, publication, specialist, production, activation, or tuning authority.

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Historical record and fictional scenario planning

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Glossary cross-reference

Terms are defined for this site’s evidence method, not as universal legal or clinical definitions.

approximate annual probability probability band consequence magnitude probability-weighted consequence score planning priority non-additive probability

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Decision matrix

Scenario evidence and publication boundary matrix
Question	Acceptable treatment	Prohibited implication
Percentage	Display as source-authored approximate annual estimate.	Calibrated probability or objective likelihood.
Magnitude	Describe strategic scale.	Moral worth, harm value, or casualty estimate.
Weighted score	Show formula and comparison-only role.	Expected loss or universal risk score.
Priority	Call it source planning priority.	Site ranking or action authorization.
Portfolio	Keep overlapping rows non-additive.	Summing probabilities across scenarios.

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Publication audit checklist

Formula

Is the workbook formula explained?

Pass condition: Readers can see how weighted score is calculated.

Calibration

Does the page deny independent calibration?

Pass condition: No percentage is called validated or predictive.

Non-additivity

Are overlapping scenarios explicitly non-additive?

Pass condition: Counts and percentages are never summed into a total likelihood.

Ranking

Is priority separated from site judgment?

Pass condition: Priority is described as a source field, not a site ranking.

Human impact

Are numbers kept separate from casualties and moral value?

Pass condition: Scores do not stand in for people, deaths, money, or rights.

LEVEL 4

RESEARCH EDITION

Sources, methods, and stable links

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Linked reports

REAL-WORLD VERIFIED

Method and corrections

This page follows the public method for provenance, confidence, source independence, alternative accounts, limitations, review state, and visible correction.

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Related learning

World Event Literacy1999–2026 World-Events Ledger: Reading 2,800 Source-Bounded RecordsHow to use a 100-record-per-year event ledger without converting a supplied dataset into an authoritative historical database.World Event Literacy2027–2036 Scenario Register: Reading 3,000 Fictional Planning RowsA field guide to the workbook’s 300 annualized scenario families, their visible fiction labels, source baselines, uncertainties, and conditional consequence paths.World Event LiteracyArchival Silences, Missing Records, and Local KnowledgeHow structural neglect, deliberate destruction, language barriers, custody, and editorial preference shape what can be known about an event.World Event LiteracyBefore-and-After, Document Readers, Statistical Panels, and Mixed ViewsWhen direct comparison, source inspection, measurement, or linked analysis is more useful than an animated map. Learning pathFrom Historical Record to Future Scenario Without False PredictionMove from the 1999–2026 source ledger into the 2027–2036 fictional register while preserving cutoffs, track identity, non-additive numerical limits, source baselines, uncertainty, and correction paths.