Writing teacher feedback literacy (WTFL), referred to as writing teachers’ repertoire of feedback competencies that involve knowledge, values, and abilities regarding feedback, is an indispensable part of teacher assessment literacy. In this project WTFL is operationalized with reference to the pedagogical framework of WTFL proposed by Lee (2021), which consists of three components: teachers’ knowledge about feedback (teacher understanding, awareness, and familiarity about feedback), values about feedback (teacher beliefs, attitudes, goals, dispositions and perceptions about feedback), and abilities to use feedback to inform learning and teaching (teacher abilities in handling the process of feedback).