# Family Liveability Index v1.1 Methodology Summary (2026-03-19)

## Scope
This press kit is based on the ward-level export neighbourhood-pillars-v1.1.csv and uses the published Family Liveability Index v1.1 scoring framework.

Snapshot date(s): 2024-06-01

## Pillars and weights
- Safety: 22%
- Schools: 20%
- Family: 16%
- Transport: 12%
- Health: 10%
- Greenspace: 8%
- Affordability: 8%
- Amenities: 4%

## Composite rule
fli_v1_1_score_100 = SUM(weight * pillar_score) / SUM(weights for non-null pillars)

All pillar scores are treated as 0-100 where higher is better. Missing pillar scores are excluded from the denominator.

## Eligibility rules
- Full export: includes all wards from the v1.1 source export, including rows scored with missing-data reweighting.
- Headline shortlist tables: require eligible_ge_min_pillars = true and eligible_headline_safety_schools = true.
- In practice, headline tables require at least 5 of 8 pillars, plus both Safety and Schools.

## Source limitation
Safety scores depend on Police UK coverage. Where force-level publication to Police UK is incomplete, Safety may be unavailable for affected wards. This currently includes gaps affecting Greater Manchester coverage.

Headline ranking tables exclude areas where Safety or Schools data is unavailable, even if a reweighted overall score exists in the full export.

## Files in this kit
- family-liveability-index-v1.1-full-2026-03-19.csv: full v1.1 export with headline eligibility fields
- family-liveability-index-v1.1-top200-2026-03-19.csv: headline-eligible Top 200 shortlist (full columns)
- family-liveability-index-v1.1-top200-2026-03-19-press.csv: simplified Top 200 shortlist for press use
- family-liveability-index-v1.1-top50-2026-03-19.csv: headline-eligible Top 50 shortlist
- family-liveability-index-v1.1-bottom50-2026-03-19.csv: headline-eligible Bottom 50 shortlist