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Bloom's two sigma problem (2020)

https://nintil.com/bloom-sigma
8•Tomte•7mo ago

Comments

trane_project•7mo 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/

Understanding the psychology behind product decisions

https://designexplained.substack.com/p/understanding-the-psychology-behind
1•kaizenb•1m ago•0 comments

Mestastic on Family Cruise – Worked Great for Family of 4

https://old.reddit.com/r/meshtastic/comments/1qd2z97/mestastic_on_family_cruise_worked_great_for/
1•lormayna•2m ago•0 comments

Back-scratching bovine leads scientists to reassess intelligence of cows

https://www.theguardian.com/science/2026/jan/19/back-scratching-cow-veronika-bovine-intelligence
2•n1b0m•2m ago•0 comments

Show HN: Eigent – the open source alternative of Cowork

1•camelaiorg•4m ago•0 comments

Let's Play Quakeworld

https://fabiensanglard.net/quakeworld/
1•_pob•4m ago•0 comments

How to Get Your First Users [video]

https://www.youtube.com/watch?v=0kARDVL2nZg
1•gmays•4m ago•0 comments

2026 Linux Audio Conference Focus on LLMs and Floss

https://lac26.mucs.club/
1•Lanedo•5m ago•0 comments

Show HN: Pipenet – A Modern Alternative to Localtunnel

https://pipenet.dev/
1•punkpeye•7m ago•0 comments

PicoPCMCIA – Yyzkevin

https://www.yyzkevin.com/picopcmcia/
1•rbanffy•7m ago•0 comments

New milestones for Nyno (open-source n8n alternative for AI Workflows, Jan. 26)

https://nyno.dev/new-milestones-for-nyno-open-source-n8n-alternative-for-ai-workflows-january-2026
3•theyogadev•8m ago•2 comments

Show HN: kevue-simple key-value in-memory database (learn C by building)

https://github.com/shadowy-pycoder/kevue
1•shadowy-pycoder•8m ago•0 comments

Building Natural Language Interface for Human Protein Atlas Data in 18 Months

https://axonagentic.ai/blog/ai-natural-language-human-protein-atlas-18-month-journey
1•rhokstar•9m ago•1 comments

Liu Thai Ker, architect behind Singapore's public housing system, dies aged 87

https://www.bbc.com/news/articles/cgez5r9029po
2•toomuchtodo•10m ago•1 comments

Show HN: Oorian – Build real-time web applications in Java

https://oorian.com
1•mwarble•11m ago•0 comments

Building Multi-Agent Systems (Part 3)

https://blog.sshh.io/p/building-multi-agent-systems-part-c0c#footnote-anchor-2-184887421
1•ramimac•11m ago•0 comments

Show HN: AI Roleplay for Behavioral Interviews and Resume Review

https://career-coach-bice.vercel.app/
1•mosse692•11m ago•0 comments

Help Me

1•forkiehackersss•11m ago•0 comments

The Microstructure of Wealth Transfer in Prediction Markets

https://www.jbecker.dev/research/prediction-market-microstructure
2•jonbecker•11m ago•1 comments

South Korea Customs Uncovers $102M Crypto Laundering Scheme

https://decrypt.co/355003/south-korea-customs-uncovers-102m-crypto-laundering-scheme
1•Brajeshwar•12m ago•0 comments

Astronomers discover an enormous iron bar in the famous Ring Nebula

https://www.space.com/astronomy/stars/astronomers-discover-an-enormous-iron-bar-in-the-famous-rin...
1•Brajeshwar•13m ago•0 comments

Nvidia GB10 Performance with the Dell Pro Max GB10 Compares to the GH200 Review

https://www.phoronix.com/review/nvidia-gb10-gh200
1•rbanffy•13m ago•0 comments

The guy who discovered South Park's creators was shocked by the new season

https://www.polygon.com/brian-graden-south-park-interview-matt-stone-trey-parker-donald-trump/
1•HelloUsername•13m ago•0 comments

How Germany Destroyed Its Own Economy (The $500B Mistake) [video]

https://www.youtube.com/watch?v=kkU3icWrISM
1•mpweiher•13m ago•0 comments

Evidence that METR may be underestimating LLM time horizons

https://www.lesswrong.com/posts/kNHxuusznCR3rhqkf/is-metr-underestimating-llm-time-horizons
1•aorobin•14m ago•0 comments

Show HN: sc-membench for modern memory bandwidth and latency benchmarks

https://github.com/spareCores/sc-membench
1•daroczig•15m ago•0 comments

Cerebras Inks Transformative $10B Inference Deal with OpenAI

https://www.nextplatform.com/2026/01/15/cerebras-inks-transformative-10-billion-inference-deal-wi...
2•rbanffy•16m ago•0 comments

WTO Awards Caribbean Country Right to Ignore US Copyright (2007)

https://m.slashdot.org/story/95086
4•Tomte•17m ago•0 comments

Oldest monastic brewery to be sold as German beer sales slide

https://www.theguardian.com/world/2026/jan/19/weltenburg-abbey-oldest-monastic-brewery-sold-germa...
1•n1b0m•19m ago•2 comments

Tunnel Vision – The Boring Company

https://www.boringcompany.com/tunnelvision
1•bilsbie•21m ago•0 comments

Ask HN: Do many people know that Grand Theft Auto is Commodore's biggest legacy?

4•amichail•21m ago•0 comments