This study deploys Actor-Network Theory (ANT) to understand how educational standards take shape. To exemplify the inherently collective nature of standards and contingency in the process of standardisation, this study will present a case of the CEFR-J project launched by a group of Japanese university academics to modify the "Common European Framework of Reference for Languages" (CEFR) for English-language teaching and learning in Japan. Drawing on documentary materials and in-depth interviews, I will describe how the CEFR has become a standard for English-language teaching in Japan while various actors were brought together through the CEFR-J project.