Without any outreach, announcement, and in the middle of the identification process the AL office has changed its appeal process. Unlike previously, any private test scores will need to be 3 standards of deviation about average i.e. 99th percentile as compared to 95th percentile from the district administered test.
This is all governed by the existing procedure: https://www.seattleschools.org/UserFiles/Servers/Server_543/File/District/Departments/School%20Board/Procedures/Series%202000/2190SP.pdf which has not been modified since last year.
While procedure changes don't require board approval, I'd argue this change is badly done on a process front. Any changes should occur before the testing season occurs and be vetted in public. We already went through this last year, when the office attempted to change rules midstream and was forced to back down.
[Thanks to several readers for bringing this to my attention.]