It belongs to immunization, the part of the welfare catalog concerned with the reach, capacity, financing, and practical availability of health services. The exact stored unit is percent of one-year-olds, the geographic presentation is global, the data publisher is World Bank, and the immutable numerical identity is WDI SH.IMM.MEAS identity. The preliminary catalog candidate 48 is reconciled to the exact official series “First-dose measles vaccination coverage (global, MCV1)” in percent of one-year-olds. This is a deliberate canonical correction: the database title names what the values actually measure, while the input wording remains in the reconciliation and audit trail. No hidden proxy label, fallback series, or silently substituted denominator remains. For catalog item 48, the provider definition is: Child immunization, measles, measures the percentage of children ages 12-23 months who received the measles vaccination before 12 months or at any time before the survey. A child is considered adequately immunized against measles after receiving one dose of vaccine. That definition controls the denominator, population, reporting instrument, and statistical meaning. This Indicator records an observed outcome; it does not assert why that outcome changed. Welfare assessment for item 48 uses higherisbetter. Higher observations are treated as better welfare relative to the dated comparative reference. The direction applies to the stored official measure after the disclosed transformation, if any, rather than being inferred from an emotionally positive or negative title. No mathematical transformation is applied before persistence. Keeping title, series identity, unit, scope, transformation, and interpretation together prevents the record from mixing incompatible measurement concepts. The numerical observations for catalog item 48 were retrieved from World Development Indicators (WDI) through https://data360api.worldbank.org/data360/data?DATABASEID=WBWDI&INDICATOR=WBWDISHIMMMEAS&timePeriodFrom=2018&timePeriodTo=2025 (opens in a new tab). The provider landing page is https://data.worldbank.org/indicator/SH.IMM.MEAS (opens in a new tab). The research package records the access date, exact dataset and series identifiers, dimension key country=all, unit, provider metadata, transformation, and yearly aggregation label. The bounded Source and Evidence records can therefore reproduce which numbers were used without treating a generic homepage as row-level proof. Measurement provenance for item 48 follows this provider method: The World Bank world aggregate is retained when it exists for a year; otherwise Factrail records a disclosed unweighted mean of reporting economies for the same exact indicator code. The aggregation label on every point distinguishes those two cases. 2018 combines 193 reporting economies; 2019 combines 193 reporting economies; 2020 combines 193 reporting economies; 2021 combines 193 reporting economies; 2022 combines 193 reporting economies; 2023 combines 193 reporting economies; 2024 preserves the existing canonical observation and its original Source and Evidence. The output keeps full numerical precision through NormalLine, deviation, and interpretation calculations. Display clients may round for readability, but the persisted value is not squeezed into a zero-to-one score and is not rounded before calculation. The item 48 NormalLine starts on 2018-01-01 at 95 percent of one-year-olds. The additional coverage NormalLine uses the same preserved WHO measles-elimination threshold of approximately 95 percent coverage with both measles-containing vaccine doses; its earlier date makes the threshold applicable to the added 2018-2023 observations without altering the existing 2023 line. For zeroisnorm, the value is exactly zero and is never relaxed because non-zero observations are common. For every item 48 point, normallinevalue copies that dated line and deviationfromnormal is stored in raw-unit terms as observation minus NormalLine. Arithmetic sign and welfare sign are separate. A positive raw deviation is adverse for lowerisbetter, favourable for higherisbetter, and adverse above zero for zeroisnorm. The custom governance score retains its provider scale and uses the public methodology explanation rather than title sentiment. The complete retained sequence is 2018: 86.418263 percent of one-year-olds; 2019: 86.233765 percent of one-year-olds; 2020: 83.880279 percent of one-year-olds; 2021: 82.041229 percent of one-year-olds; 2022: 83.692899 percent of one-year-olds; 2023: 83.01375 percent of one-year-olds; 2024: 84 percent of one-year-olds. The first observation is 86.418263 percent of one-year-olds in 2018 and the latest is 84 percent of one-year-olds in 2024. The absolute change is -2.418263 percent of one-year-olds, equivalent to -2.79832400704% of the absolute starting level. The minimum observed value is 82.041229 percent of one-year-olds, and the maximum is 86.418263 percent of one-year-olds. For catalog item 48, the latest observation differs from the NormalLine by -11 percent of one-year-olds and is classified as negative under higherisbetter. That classification is a deterministic comparison, not a causal explanation or editorial verdict. A movement may reflect real change, altered reporting coverage, revised estimates, a changed survey frame, or several of those at once. There are 7 retained item 48 observations in the selected 2018-2025 research window. The retained observations satisfy the minimum temporal rule without interpolation, extrapolation, or forward filling. Missing years are absent observations, not zeroes. The sequence is intentionally irregular when the official source is irregular, because a smooth-looking line created by invented values would be methodologically false. The displayed global item 48 sequence has one consistent numerical identity: WDI SH.IMM.MEAS identity. No second source series is spliced into a gap, no latest value is copied into a missing year, and no country-only observation is relabelled as a World value. If the source later adds or revises an observation, the update must arrive as a new reviewed research package with its own checksum and audit record. A defensible graph edge requires an existing Driver, direction, strength, lag, confidence, and Source/Evidence that supports the mechanism. The outcome series alone cannot establish that causal chain. For item 48, importance weight 0.85 is generated by indicator-importance-rubric-v1. Its five committed components are directness 0.75, population reach 0.7, persistence 0.9, effect on human capabilities 0.9, and overlap control 0.75. The formula weights them 0.35, 0.25, 0.20, 0.15, and 0.05, then rounds to the nearest 0.05. The value is deterministic and reproducible; it is not an intuitive score assigned while drafting prose. The 2018-2024 sequence for item 48 is too short for strong causal or structural claims. Cross-economy comparability can be affected by institutional definitions, survey coverage, modelled estimates, missing observations, classification practices, revisions, and unequal statistical capacity. A global aggregate or unweighted reporting-economy mean can also conceal distributional extremes and should not be used as an individual-level estimate. The item 48 NormalLine is a transparent comparative reference, not a claim that every jurisdiction has the same legal target or feasible frontier. The source may revise both historical points and metadata. Any later refresh must preserve the earlier Source, Evidence, checksum, and audit trail; it must not mutate the meaning of an already reviewed series identity.