Q&A: Melinda Gates on the World’s Missing Data About Women

“What we don’t measure, we don’t work on.”

Businessweek Debrief: A Conversation with Melinda Gates

This year’s annual letter from the Gates Foundation takes a slightly different format: It’s written to Warren Buffett, who 10 years ago pledged $30 billion to the foundation.

Warren’s really inspired us. For years he’s written an annual letter for Berkshire Hathaway to talk to the shareholders about how he’s thinking about the business. Given that it’s the 10-year anniversary of his gift, we thought, let’s use that as a marker to really spend some time, Bill and I, reflecting on what we have accomplished, as if we’re trying to tell him what his return on investment has been. It ended up being a really good exercise for both of us.