On 1991. Vientiane International School (VIS) is an International Baccalaureate World School in Vientiane, Laos, established in 1991. VIS now has an enrollment of approximately 495 students from Preschool through to Grade 12. VIS offers all three IB programmes, the PYP for ages 4–10, and MYP for ages 11 – 15, along with the IB Diploma in Grades 11 and 12 for ages 16 – 18. Classes have a maximum size of 22 students. All primary classes have a full-time teacher assistant to support learning programmes.