In January 2016, my colleagues and I from an interdisciplinary research group at NYU asked a group of human rights researchers and advocates about the challenges they face when using data visualization. Mixing formal interviews with informal discussion, we found that responses revealed a few common themes. Drawn from this modest sample, here are ten questions on the minds of the rights professionals we spoke to, challenges that complicate and impede the use of data visualization in human rights work.

So you want to organize a very large protest march? There's no one better to ask than Leslie Cagan. Leslie has helped organize some of the biggest marches in recent history. To name just a few:

• the 1967 March on the Pentagon
• the 1982 anti-nuclear protest in Central Park—then the largest anti-nuclear protest and largest political demonstration in American history
• the 1987 March on Washington for Lesbian and Gay Rights
• the 2003 march against the Iraq War
• the 2004 protest around the Republican National Convention
• and the People’s Climate March in 2014.

I interviewed Leslie in November 2015. Both Leslie and I have lightly edited the text below for clarity.