| April 2010 |
opening Tokyo West International Elementary School in Shibasaki, Tachikawa, Tokyo. |
| November 2010 |
the school moved to Sunagawa, Tachikawa, Tokyo, and adopted the name Tokyo West International School, reflecting its broader educational mission. |
| October 2013 |
the school reached a significant milestone when Tokyo West International School were accredited by AdvancED, now known as Cognia, is a globally recognized nonprofit organization that provides accreditation and certification to schools and educational institutions. Cognia was formed through the merger of three leading education organizations: AdvancED, Measured Progress, and the Northwest Accreditation Commission (NWAC). Continuing its pursuit of excellence, |
| April 2015 |
the school had another major development by moving to its current campus in Umetsubo, Hachioji. This relocation enabled the institution to open its middle school department, further expanding its educational offerings. |
| February 2020 |
Tokyo West International School took a significant step toward enhancing its curriculum by becoming a candidate school for the International Baccalaureate Primary Years Programme (IB PYP). |
| November 2021 |
Tokyo West International School became a member of The East Asia Regional Council of Schools (EARCOS), an organization comprising 199 member schools in East Asia. |
| May 2022 |
when the school officially became an authorized IB PYP school, solidifying its commitment to providing a high quality, internationally recognized education. |
| March 2023 |
Tokyo West International School achieved a significant milestone by becoming a member of the Council of International Schools (CIS). CIS is a globally recognized organization that sets high standards for international education, offering accreditation and support to schools committed to excellence. |
| April 2024 |
Tokyo West International School celebrated a significant milestone with the commencement of its high school department. This momentous event marked the expansion of TWIS’s educational offerings to include a complete secondary education program, further enhancing the school’s ability to provide a comprehensive and continuous learning journey from Pre-Kindergarten through High School. |
