The goal of this qualitative study was to examine teacher noticing of specific interactions related to the formative assessment process during teachers' participation in an on-line video club. Nineteen teachers used an electronic video coaching platform, Edthena to view peers' videos and provide electronic feedback specific to the formative assessment process. Seven hundred and twenty-seven comments by participants were analyzed for both topics of comments related to interactive formative assessment and the type of response. The findings revealed that comments within the on-line video club focused predominantly on one aspect of formative assessment, questioning. Additionally, teachers were most comfortable validating fellow teachers' practices as opposed to providing recommendations for future practice. Implications for future use of on-line video clubs are included.