The Teaching and Learning International Survey (otherwise known as TALIS) is a survey conducted every five years that asks teachers and school leaders from around the world about the working conditions and the learning environment in their schools. There have been two rounds of the survey so far, one in 2008 and one in 2013, with 50 countries scheduled to participate in the 2018 round of TALIS. We chat to Noémie Le Donné, an Analyst in the OECD's Directorate for Education and Skills, about how the survey works, what the results show us, and how the data affect the education world at large.