A common scale for
experienced suffering

No. USU is a proposed framework, and the current event estimates are proofs of concept. Defining a reference gives the calculation a unit; it does not establish that different people or different kinds of suffering can already be compared accurately.

Intensity assignments, duration assumptions, and comparisons across experiences need empirical testing. Consistent arithmetic makes an estimate reproducible, but does not make its assumptions correct.

Case counts and death tolls describe essential parts of an event, but do not combine how many people suffered, how intensely, and for how long. A common unit makes those dimensions explicit and helps readers examine harms that might receive little attention.

USU adds one perspective alongside the original indicators, clinical evidence, and the priorities of affected people. A large estimate alone does not determine which response is most effective or most urgent.

Kidney-stone pain offers a concrete example of an intense experience over time, with a clinical literature on pain and treatment response. The reference is a specified six-hour pain profile chosen as a convention. It is not the measured average of all kidney-stone episodes.

The six-hour boundary does not imply recovery at that point. Changing only the reference rescales fixed modeled burdens by a common factor; changing how experiences are mapped can also change their relative order.

No. It means twice the modeled cumulative burden of the reference under the declared method. It does not mean the same peak pain, the same symptoms, or a literally interchangeable experience. A longer, less intense state can accumulate more USU than a short, intense one.

The WSI prototype uses shared representative courses for each condition and course type. Source reports establish the population count, while clinical or contextual evidence informs a plausible duration and the description of the experience. The numerical intensity remains an explicit judgment.

The average applies across the whole modeled course, including periods of relief and sleep, rather than treating peak distress as continuous. Research is also exploring direct episode and duration comparisons, symptom-based mappings, and structured expert elicitation.

It can, where the fatal cases belong to the population and period being modeled and a suitable course can be specified. In current WSI illness reports, the fatal course replaces the ordinary course for those cases. A terminal period is not added on top of a course that already includes it.

Death itself and years of life lost are reported separately. There is no experienced suffering after death in this framework. When the available death count cannot be matched to the modeled population, fatal suffering may remain unestimated; that does not mean it was zero.

Bereavement is outside the current WSI prototype to keep the first estimates manageable. It is not excluded from the broader concept of experienced suffering. A future grief estimate would need its own population, time window, mapping, and treatment of overlap.

Several labels can describe the same person’s experience at the same time. WSI therefore starts with one combined experience course for each modeled group, rather than adding separate symptom scores. Its ordinary and fatal illness groups are mutually exclusive within the matched population.

Broader research models can use explicit rules for concurrent states, including the bounded overlap rule in the v2 preprint. That rule is a modeling convention, not an established law of experience. Separate event totals can also cover overlapping populations or periods.

Yes, as comparisons of the experiences actually included under the stated assumptions. A displacement estimate and an illness estimate can be examined on the same declared scale, but neither automatically covers all suffering caused by the event.

Check the population, reporting period, included experience, and method version. Partial estimates are not guaranteed lower bounds: omissions can reduce a total while overly high assumptions can increase it.

They are different applications of the framework. The published v2 examples use intensity and duration distributions and a nonlinear weighting option, p = 1.25. The WSI prototype uses a simple linear calculation, p = 1, with shared average courses.

Population snapshots, reporting periods, and treatment of fatal cases may also differ. The older research examples below retain their original labels and figures so they are not mistaken for current WSI estimates.

Yes. Adding burden across people and time can produce that result. A total should therefore be read alongside severity, duration, affected groups, death counts, and other relevant information.

USU does not measure human worth, rights, fairness, happiness, or the full value of a life. It cannot by itself resolve ethical choices about whose needs deserve attention.

Those would require separate validation. The current framework is not a validated clinical instrument and should not replace patient-reported outcomes or professional assessment.

The present reference and examples are human-centered. Applying a similar structure to other species would require species-specific evidence and animal-welfare expertise; human and non-human estimates should not be combined by default.

Start with the published preprint and its supplementary materials, and the WSI event method. WSI reports expose their source counts, course assumptions, calculation components, and exclusions.

Useful next steps include testing whether people understand the reference, collecting experience comparisons, examining mapping stability across groups, and checking whether conclusions change under plausible alternatives. Please get in touch with corrections or research ideas.