A significant challenge in studying formative assessment is the lack of suitable instruments for assessing teachers' formative assessment practices. This paper reports the development of the Teacher Formative Assessment Practice Scale (TFAPS) and its psychometric properties based on two samples of primary and secondary school teachers: one from Hong Kong (N = 449) and the other from Italy (N = 309). Exploratory factor analysis identified two distinct factors, including teacher-directed formative assessment (TdFA, six items) and student-directed formative assessment (SdFA, four items). The confirmatory factor analysis supported this two-factor structure. Rasch analysis provided further psychometric evidence regarding scale dimensionality and item quality. This study suggests that TFAPS is an appropriate instrument for assessing teachers' formative assessment practices, but the cultural influence on teachers' formative assessment practices should be noted in the applications of the instrument. Copyright © 2022 SAGE Publications.

Despite the critical role of formative assessment in instruction, there is a lack of theory-driven instruments that specifically assess teachers’ formative assessment literacy. This paper reports the development and validation of the Teacher Formative Assessment Literacy Scale (TFALS). The instrument was developed on a three-dimensional model of formative assessment, aiming at assessing the conceptual, practical, and socio-emotional aspects of formative assessment literacy. Survey data were collected from 585 teachers in Hong Kong primary and secondary schools. Exploratory factor analysis suggests a three-factor structure, and confirmatory factor analysis supports this structure. Rasch analysis results further support its scale dimensionality and item quality. In addition, the relations between TFALS scores and teachers’ formative assessment practices demonstrate the instrument’s external validity. Overall, the results suggest that the TFALS is an appropriate instrument for assessing teachers’ formative assessment literacy. The potential of using the TFALS in research and practice is discussed. Copyright © 2022 Elsevier Ltd. All rights reserved.

A significant challenge in studying formative assessment is the lack of suitable instruments for assessing teachers’ formative assessment practices. This paper reports the development of the Teacher Formative Assessment Practice Scale (TFAPS) and its psychometric properties based on two samples of primary and secondary school teachers: one from Hong Kong (N = 449) and the other from Italy (N = 309). Exploratory factor analysis identified two distinct factors, including teacher-directed formative assessment (TdFA, six items) and student-directed formative assessment (SdFA, four items). The confirmatory factor analysis supported this two-factor structure. Rasch analysis provided further psychometric evidence regarding scale dimensionality and item quality. This study suggests that TFAPS is an appropriate instrument for assessing teachers’ formative assessment practices, but the cultural influence on teachers’ formative assessment practices should be noted in the applications of the instrument. Copyright © 2022 The Author(s).