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Bloom's two sigma problem (2020)

https://nintil.com/bloom-sigma
8•Tomte•1y ago

Comments

trane_project•1y ago
> Nonetheless, Bloom was on to something: Tutoring and mastery learning do have a degree of experimental support, and fortunately it seems that carefully designed software systems can completely replace the instructional side of traditional teaching, achieving better results, on par with one to one tutoring. However, designing them is a hard endeavour, and there is a motivational component of teachers that may not be as easily replicable purely by software.

I've been working on an implementation of mastery learning and other related techniques called Trane (https://github.com/trane-project/trane/) for the past three years or so. Mastery learning is the main one, but it also integrates spaced repetition, interleaving, mixing difficulties, and reward propagation (doing well or bad in an exercise affects how related exercises are scheduled).

I think it works pretty well, but you need to pair it with proper pedagogy of the skill you want to learn and the proper curriculum. The latter is the hardest part, so it's being my main limitation. I've used some external resources to build courses, and they work well, but obviously it would work much better with a full curriculum built from the ground up.

Currently working on Pictures Are For Babies (https://picturesareforbabies.com/), which is meant to do just that for literacy. I am hoping to do a first release soon. As for the motivation angle, the solution in this particular instance is fairly simple. Use the software to enforce scheduling andpedagogy,y and a human tutor to provide emotional and social support. This division allows any literate person to become an effective tutor with a few hours of training.

I am hoping that the average student can complete the whole curriculum in five years. That would mean that (assuming they start at between 4 and 5 years old), the average student would have college-level reading and writing skills by the time they are nine or ten.

Most complete explanation so far is in the pedagogy page: https://picturesareforbabies.com/home/pedagogy/

Inside Xi Jinping’s Strategy to Export Ideas on State Control

https://www.nytimes.com/2026/05/27/world/asia/china-solomons-pacific-security-threats.html
1•Cider9986•2m ago•0 comments

The Sludge on the Wall

https://grox.io/blog/28-the-sludge-on-the-wall/
1•iroddis•3m ago•0 comments

DNS over HTTPS, DNS over TLS, DNS over QUIC: Encrypted DNS Protocol Comparison

https://www.copahost.com/blog/encrypted-dns/
1•ggallas•3m ago•0 comments

Prosody IM 13.0.6 released – An XMPP/Jabber server written in Lua

https://blog.prosody.im/prosody-13.0.6-released/
1•neustradamus•3m ago•0 comments

Delta Steered Around Airline Industry Chaos

https://www.nytimes.com/2026/05/26/business/delta-airlines-ed-bastian.html
1•Cider9986•3m ago•0 comments

Writing Is Fundamental to How We Think

https://www.nytimes.com/2026/05/27/opinion/writing-creativity-ai.html
1•Cider9986•4m ago•0 comments

Paper from 1967 explaining origins of life was initially rejected 15 times

https://spacedaily.com/n-the-paper-that-explained-why-every-living-thing-on-earth-exists-was-reje...
1•Jimmc414•5m ago•1 comments

Is Peter Thiel the Target of Pope Leo's Gandalf Quote? An Investigation

https://arstechnica.com/tech-policy/2026/05/is-peter-thiel-the-target-of-pope-leos-gandalf-quote-...
1•vintagedave•5m ago•0 comments

Create Business DNA

https://labs.google.com/pomelli/
1•modinfo•10m ago•0 comments

Hilbert Transform as an Infinite Matrix

https://www.johndcook.com/blog/2026/05/23/hilbert-transform-as-an-infinite-matrix/
1•ibobev•11m ago•0 comments

Expected IQ Spread on a Jury

https://www.johndcook.com/blog/2026/05/26/expected-iq-spread-on-a-jury/
3•ibobev•11m ago•0 comments

Show HN: Epstein Index – Stock returns of Epstein-linked companies since 2008

https://epstein-index-six.vercel.app/
2•milanmuriithi•11m ago•0 comments

Hacker Just Revealed Tucker's Social Security Live on the Podcast [video][9 Min]

https://www.youtube.com/watch?v=5HfHvuuAmCQ
1•Bender•11m ago•0 comments

Fast Robot Kinematics and Dynamics in Jax

https://github.com/StanfordASL/frax
1•aanet•11m ago•1 comments

Workshop: Launch sandboxed development environments with a single command

https://ubuntu.com/blog/introducing-workshop-sandboxed-development-environments
1•dgavrilov•12m ago•0 comments

Calculating the expected range of normal samples

https://www.johndcook.com/blog/2026/05/26/calculating-expected-normal-range/
1•ibobev•12m ago•0 comments

Why Good Engineers Become Worse with AI

https://nidhish.dev/writing/good-engineers-worse-with-ai/
1•sneruz•17m ago•0 comments

Ask HN: How should universities teach coding now that every student uses AI?

1•devanshranjan•20m ago•1 comments

The Score: How to Stop Playing Someone Else's Game

https://www.lrb.co.uk/the-paper/v48/n10/david-runciman/trivial-pursuits
1•mitchbob•20m ago•1 comments

OpenAI Foundation commits $250M to help navigate AI disruption

https://www.reuters.com/business/openai-foundation-commits-250-million-help-workers-economies-nav...
1•geox•21m ago•1 comments

The fastest way to say each number

https://thegraycuber.com/fast_numbers/
1•marvinborner•21m ago•0 comments

I turned a 3-hour CSV data entry nightmare into a 10-second QuickBooks import

https://www.indiehackers.com/post/how-i-turned-a-3-hour-csv-data-entry-nightmare-into-a-10-second...
1•finconvertly•22m ago•0 comments

Why recessions are usually just bad luck

https://worksinprogress.co/issue/review-recession-the-real-reasons-economies-shrink-and-what-to-d...
2•paulpauper•22m ago•0 comments

Why AI Pipeline Needs Kafka and How Zilla Makes Kafka AI-Ready

https://www.aklivity.io/post/why-ai-pipeline-needs-kafka-how-zilla-makes-kafka-ai-ready
1•luk212•23m ago•0 comments

Cloudflare on Fire

https://medium.com/@kilian.houpeurt/moley-a-free-open-source-ngrok-alternative-using-cloudflare-f...
1•xonery•23m ago•0 comments

The State of AI and Automation Tools in 2026

https://deepresearch.ninja/2026/05/The-State-of-AI-and-Automation-Tools-in-2026/
2•jackalxyz•24m ago•0 comments

Flatpak Next: Dropping Systemd and X11? [video]

https://www.youtube.com/watch?v=Ys44BKMd7i8
1•LelouBil•27m ago•1 comments

What Does a Marine Sniper Think About War in Iran? [video][19 Mins][Language]

https://www.youtube.com/watch?v=TAT-f1iFxaU
1•Bender•27m ago•0 comments

Meta launches Instagram, Facebook and WhatsApp subscriptions including AI plans

https://techcrunch.com/2026/05/27/meta-officially-launches-instagram-facebook-and-whatsapp-subscr...
3•mfiguiere•28m ago•1 comments

Claude Code's creator on the end of the software engineer

https://www.platformer.news/boris-cherny-interview-ai-jobs/
1•speckx•28m ago•0 comments