Hi Jeffrey!

Thanks for sharing your thoughts on the way mastery percentages are sometimes lowered with content addition. I can understand how frustrating that can be. We are always working to add features that improve our site, and we love getting input from our community.

I've passed your feedback along to the team, and it will be part of our conversation as we plan the future of Khan Academy.

Thanks for helping improve Khan Academy!

I agree with Jeffrey 100%. When a course is updated or significantly changed, it is important for students to be able to continue with the "old" version of the course until completed. For example, we started the Big History course this past spring and greatly enjoyed it but did not complete it. Now, after a month summer break, we're disappointed (yes, annoyed!) to return to a completely different version of the that course on Khan and to see that it appears to be impossible to continue where we left off in July.  Surely there must be a way to archive the content of a particular course to allow a user to finish it?

Or at least alert users 3-6 months ahead that a course update is coming.

Hi Hayden, 

You're absolutely right! We completely understand. We do have the old course available for you to finish. Here you go! https://www.khanacademy.org/humanities/big-history-project

Usually, we give a few months' notice for major changes. I apologize that we didn't provide you with that for this course update. 

Ben (on the content team at Khan Academy)

Many THANKS for this.