The Classroom Conveyor Belt

by Justin Skycak (@justinskycak) and Sanjana Kulkarni on

(Note: This is an AI-assisted teaser for my prior manual writing. If you like it and want to read more details about this topic/perspective, then check out my 100% manually-written blog and books!)

Want to get notified about new posts? Join the mailing list and follow on X/Twitter.


In most schools, the classroom conveyor belt moves forward continually at the same pace for every single student.

Ready or not, the students just get carried forward.
Even if fractions are only halfway mastered, even if they barely understand algebra – they’re just going to keep moving because the calendar says it’s time.

The conveyor belt does not just move the students forward.
It also moves their knowledge gaps forward.
Those don’t get left behind. Those are on the conveyor belt too.

Eventually those gaps arrive at a class that depends on them, and everything jams.

That’s why progression has to depend on mastery, not the date on the calendar.
If the foundation isn’t ready for a student, stop the belt and fix it.

∗     ∗     ∗

Here are the 100% manually-written long-forms that this teaser is distilled from, if you want to dive deeper:



Want to get notified about new posts? Join the mailing list and follow on X/Twitter.