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Bloom's two sigma problem (2020)

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

Comments

trane_project•8mo 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/

Show HN: Scrumboy an anonymous paste-bin style Kanban board and Jira alternative

https://scrumboy.com
1•markrai•37s ago•0 comments

Why Some People See Collapse Earlier Than Others

https://adrianlambert.substack.com/p/why-some-people-see-collapse-earlier
1•zeech•1m ago•0 comments

SHDL – A Minimal Hardware Description Language Built from Logic Gates

1•rafa_rrayes•3m ago•0 comments

I cut Claude API costs from $70/month to pennies

1•ok_orco•4m ago•1 comments

LLMs vs. Geolocation: GPT-5 Performs Worse Than Other AI Models (2025)

https://www.bellingcat.com/resources/2025/08/14/llms-vs-geolocation-gpt-5-performs-worse-than-oth...
1•mooreds•4m ago•0 comments

Parsing Counter-Strike 2 demo files in .NET

https://counterstrike.blog/blog/guides/extract-demo-files-csharp/
1•sieep•4m ago•0 comments

Field of clones: How horse replicas came to dominate polo

https://knowablemagazine.org/content/article/technology/2026/cloned-polo-horses
1•wjb3•5m ago•0 comments

Clawdbot - open source personal AI assistant

https://github.com/clawdbot/clawdbot
2•KuzeyAbi•11m ago•0 comments

Does Pentagon Pizza Theory Work?

https://www.lesswrong.com/posts/Li3Aw7sDLXTCcQHZM/does-pentagon-pizza-theory-work
1•nreece•15m ago•0 comments

Insect Pollination Before Angiosperms and Lessons for Modern Ecosystems

https://www.mdpi.com/2075-4450/17/1/103
1•PaulHoule•18m ago•0 comments

PyTorch to CoreML converter that generates production Swift/Kotlin code

https://refactor-ai-website.vercel.app/#
1•AbdoulayeSeydi•18m ago•0 comments

The Engineer who invented the Mars Rover Suspension [video]

https://www.youtube.com/watch?v=QKSPk_0N4Jc
1•skrubis•18m ago•0 comments

Zip Game Unlimited

https://zipgameonline.com
1•jgsteven•18m ago•0 comments

/Sanctuary – A Terminal Elegy

https://a-life.vercel.app/
1•mattcbaker•19m ago•0 comments

Conservatism Consists of One Proposition

https://crookedtimber.org/2018/03/21/liberals-against-progressives/
1•ravenical•20m ago•0 comments

AI Took Control of My Life and I Love It

https://www.thefp.com/p/ai-took-control-of-my-life-and-i
1•mhb•21m ago•0 comments

If You Want Different Outcomes, You Have to Do Different Things

https://freddiedeboer.substack.com/p/if-you-want-different-outcomes-you
1•c0nsumer•24m ago•0 comments

The Engineering Behind Clawdbot

https://vindler.solutions/blog/clawdbot-technical-deep-dive
1•cdutra•25m ago•0 comments

The clever way food trucks are now using e-bike batteries

https://electrek.co/2026/01/25/the-clever-way-food-trucks-are-now-using-e-bike-batteries/
3•jerlam•27m ago•0 comments

Scientists Identify Brain Waves That Define the Limits of 'You'

https://www.sciencealert.com/scientists-identify-brain-waves-that-define-the-limits-of-you
2•mikhael•27m ago•0 comments

GNU Guix 1.5.0 Released

https://guix.gnu.org/blog/2026/gnu-guix-1.5.0-released/
1•_emacsomancer_•30m ago•0 comments

Show HN: Beach Report – Real-time beach conditions, weather, and surf reports

https://beach.report
1•theantonym•30m ago•0 comments

Halley's Comet wrongly named: 11th-century English monk predates British astrono

https://phys.org/news/2026-01-halley-comet-wrongly-11th-century.html
5•bookmtn•31m ago•1 comments

Tell HN: I Have Won HN

10•neilv•34m ago•6 comments

Cool Discussion on Signs

https://old.reddit.com/r/OpenChristian/comments/13ogqcn/signs_from_god_does_anyone_feel_this_actu...
1•marysminefnuf•39m ago•2 comments

MIT-Human License Proposal

https://github.com/tautvilas/MIT-Human/blob/main/LICENSE
2•brisky•40m ago•3 comments

Trade an alliance for an island? That's a bad deal

https://www.cnn.com/2026/01/25/politics/greenland-nato-ancient-greece-expert-analysis
2•breve•41m ago•0 comments

De-Vibing a Codebase

https://dumbideas.xyz/posts/de-vibing-a-codebase/
2•omegastick•42m ago•0 comments

Google's Gist: Greedy Independent Set Thresholding for Retrieval Explained

https://websiteaiscore.com/blog/gist-vector-exclusion-zones
2•aggeeinn•43m ago•1 comments

Show HN: GroqBash – Single‑File Bash Client for Groq API

https://github.com/kamaludu/groqbash
1•kamaludu•45m ago•0 comments