=== Bucketing criteria
**Bucketing Requirements:**
* Bucketing should include both registered and unregistered users at all identified participating wikis.
* All users, who are editing a **desktop or mobile** main namespace page (NS:0), at any of the participating wikis should have a 50% chance of being included/bucketed into the A/B test's control or treatment group.
* Bucketing should be done on a per-Wikipedia basis. 50% of people within a given wiki should be placed within the control group; 50% should be bucketed in the treatment group
* The test group should have multi-check (references) experience enabled while the control group should only have the single Reference Check enabled (the current default experience at those wikis).
* People should remain in the same test group for the duration of the test (and across sessions and pages).
**Instrumentation-Related Requirements**
* A bucket is applied to these events so we can distinguish all events logged for the control group and the test group within the A/B test.
* The bucket should be descriptive of the test in case there are every overlapping AB tests. For example, `2025-03-multicheck-reference-[test/control]`
* The `anonymous_user_token` field is populated for unregistered users in the test.
=== Participating wikis
|Wiki|Feedback/Notes|Status
|---|---|---
| ar.wp | |
| afwiki | |
| eswiki | |
| frwiki | |
| igwiki | |
| itwiki | |
| jawiki | |
| ptwiki | |
| swwiki | |
| yowiki | |
| viwiki | |
| zhwiki | |
=== Tech/News Draft
!!@Trizek-WMF to draft!!
=== Edit Check Configuration
For the purposes of this A/B test, we're going to strive for the wikis that will participate to configure Edit Check in a consistent way. Doing so will enable us to draw wiki-agnostic conclusions about the impact(s) Edit Check causes.
Prompted by the question @Mneisler posed in T346837#9180760 and what we talked about offline on 20 Sep,