by | September 2023

Last updated the 1st of September 2023.

In our ongoing commitment to transparency and continuous improvement, we maintain this changelog to document updates to our assessments of various charitable organisations. Below, you’ll find a record of changes made to our cost-effectiveness estimates for different charities, along with the key details of each update.

This is a new website page, and we’re still thinking about what to include here and how best to present it. Feel free to send any feedback to


Charity Version Date published WELLBYs per $1000 donated Changes
StrongMinds 3 Expected October 2023 Expected as less than 62 New version to improve our analysis and address concerns raised (in progress).
StrongMinds 2.5 No publication; updated based on communications in February 2023 62 Updated spillover figure based on our response to James Snowden’s post.
StrongMinds 2 2 April 2022 77 Added household spillover effects.
StrongMinds 1 2 October 2021 22 Initial publication focused on individual effects.
GiveDirectly 2 2 April 2022 8 Added household spillover effects.
GiveDirectly 1 2 October 2021 2 Initial publication focused on individual effects.