• 2026.07.29 QUARTET ONLINE has been enhanced for your convenience!

• 2025.07.25 Textbook answer keys are now available on the Learner's Page

• 2024.10.24 Nepali vocabulary lists for readings have been added to the Learner's Page

• 2024.09.10 You can now watch intro videos by the authors!

• 2024.01.09 Myanmar and Indonesian vocabulary lists for readings have been added to the Learner's Page

• 2023.09.01 German vocabulary lists for readings have been added to to the Learner's Page

• 2021.11.09 Simplified Chinese vocabulary lists for readings have been added to the Learner's Page

• 2021.03.25 QUARTET Online launched as the official website for QUARTET: Intermediate Japanese Across the Four Language Skills.