Methodology

How Vector | WA scores bills

Vector reads every bill in the Washington State Legislature and gives each one a 0–99 trajectory score— a quick read on how likely it is to keep advancing. Plain-English summaries are AI-generated from the Legislature's official record and refreshed through the day. The score is an estimate, not legal or political advice.

How the score works

Five signals, weighted and combined, then adjusted by procedural X-factors:

Committee — Hearings, executive sessions, and votes -- a bill that gets a hearing is in a different world from one that doesn't.

Sponsor — Majority-party sponsors, committee chairs, and bipartisan rosters all signal support.

Momentum — Moving recently, or stalled?

History — How bills in the same category have fared in past sessions.

Fiscal — No-cost bills move faster than ones that need funding.

X-factors nudge a score up (pulled from Rules, companion bill filed, strong floor margin) or down (held in Rules, cutoff pressure, stalled). One held-in-Rules event can drop a bill a full tier.

HIGH 75-99Moderate 60-74Low 45-59Very Low 0-44

Track record

~84%of HIGH-tier bills (score 75+)
became law across past sessions

Most bills don't pass, so a high score means on track, not guaranteed.

Limits

It's a pattern-based estimate and can be wrong, and AI summaries can contain errors — verify anything important against the official record, linked on every bill. The model doesn't use the governor's priorities, lobbying registrations, whip counts, or campaign finance. When the Legislature adjourns, each bill is marked Signed into Law, Passed Chamber, or Dead, and its score freezes until it is reintroduced.

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