The EF EPI research series has three separate reports: this main EF EPI report, which looks at adult English proficiency; the EF EPI for Companies (EF EPI-c), which examines workforce English; and the EF EPI for Schools (EF EPI-s), which tests secondary school and university students around the world. This year, we are publishing the EF EPI sixth edition and the EF EPI-c third edition.