Designing a programming system for understanding programs
Bookmarked => “Learnable Programming” by Bret Victor on Worry Dream.
I haven’t had a chance to check it out but the link came from a very reliable source / colleague. This is in the footer:
“Much thanks to Star Simpson, Dan Amelang, Dave Cerf, Patrick Collison, Christina Cacioppo, and Oliver Steele for their feedback on this essay.