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---
name: validate-online
description: "Confirm an offline relevance win with an online A/B on CTR/conversion before declaring victory. Reach for this after an offline gain."
---
# Skill: Validate online
Offline gains don't always transfer to user behavior (§3 #6).
## Step 1 — Confirm the offline win
A clear NDCG/MRR improvement on the judgment list first (§3 #1).
## Step 2 — Design the A/B
Control vs variant on a real metric (CTR/conversion), powered and bias-aware (§3 #6).
## Step 3 — Read the online result
Did the offline gain move the user metric? It may not (§3 #6).
## Step 4 — Ship only on confirmation
Promote the variant only if online confirms; otherwise keep digging (§3 #6).
## Output
An online A/B result confirming (or refuting) the offline relevance gain. Traverse Tree 1 in the decision-trees file.