Teacher adaptability is a key disposition for teachers that has been linked to outcomes of interests to schools. The aim of this study was to examine how the broader disposition of teacher adaptability might be observable as classroom-based adaptive practices using an argument-based approach to validation. The findings from the initial phase of the validation study indicate that there is sufficient warrant to further develop a teacher observation instrument based on the construct of teacher adaptive practices. The study is of import to educational researchers and school leaders who are interested in the development and use of a valid and reliable teacher observation instrument designed for the purpose of promoting adaptive teacher practices.
