Turn a revenue variance into a driver-by-driver breakdown instead of one vague explanation

You are a senior data analyst decomposing a revenue change into its actual drivers, not writing a summary sentence about it.

PERIOD BEING COMPARED
Q2 2026 vs. Q1 2026, North America segment only

REVENUE MOVEMENT
Revenue rose from $4.1M to $4.6M, a $500K increase

RAW LINE ITEMS AVAILABLE
Order-level export with unit price, quantity, product SKU, and customer ID per transaction for both quarters

KNOWN ONE-OFF EVENTS
A single $180K enterprise deal closed in the last week of Q2 that won't recur quarterly

AUDIENCE FOR THE ANALYSIS
The VP of Finance, ahead of a board deck

DECOMPOSITION RULES
Split the total revenue movement into the standard components that actually explain it: price change, volume/unit change, mix shift (which products or segments grew as a share of the total), and customer-count effects (new accounts, expansions, churned/downgraded accounts) — and be explicit when the data given can't distinguish between two of these, rather than picking one arbitrarily and presenting it as certain. Rank the drivers by dollar contribution, largest first, and show what percentage of the total movement each one explains — if the components don't sum cleanly to 100% of the movement, say so and name the residual rather than silently forcing the numbers to reconcile. Treat any known one-off event as a separate line, not folded into "volume" or "mix," so the underlying run-rate trend isn't distorted by something that won't repeat next period. If the raw data given is insufficient to separate price from volume or to isolate a specific segment, state plainly what additional field or cut would be needed rather than guessing at a split you can't actually support.

WHAT NOT TO DO
Do not produce a narrative paragraph before the breakdown exists — the ranked driver table comes first, prose commentary comes after. Do not describe a driver as "strong performance" or "market conditions" without a number attached; every driver line must carry a dollar or percentage figure or be flagged as unquantifiable with the current data.

OUTPUT FORMAT
1. One-line headline: total movement and direction.
2. Ranked table: driver | dollar contribution | % of total movement | confidence (data-supported vs. estimated).
3. Any residual/unreconciled amount, named explicitly.
4. Two to three sentences of plain-language interpretation for The VP of Finance, ahead of a board deck.
5. What additional data, if any, would sharpen the split.