I applied online. The process took 2 weeks. I interviewed at Human Rights Watch in Apr 2014
Interview
I submitted an unsolicited application and received an email after about two weeks with an invitation for a phone call. I confirmed and then had a 30-min interview with my later supervisor. It was a nice and friendly talk; I wasn't asked difficult questions, it was rather an exchange of ideas and the supervisor mostly talked about what the internship would look like.
Interview questions [1]
Question 1
Q: What do you expect from the internship?
Q: When would you have time to start the internship?