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12 Words or LessEdit
Doing the most good. (Note: this is the Salvation Army's current slogan.)
The most bang for your charitable buck.
Doing a good job of making people's lives better. --Adam Zerner
50 Words or LessEdit
Effective Altruism is the ongoing process of asking yourself: how can I do the most good, and what is the evidence that what I am doing is effective? --James Fodor