The idea of data-based decision-making (DBDM) at the classroom level is that teachers use assessment data to adapt their instruction to students' individual needs and thus improve students' learning progress. In this study, we first investigate this theoretically assumed DBDM process, and second, we evaluate the effectiveness of teacher support on…

This mixed-method study examined the impact of an online formative assessment tool on the language and early literacy skills development of 204 3-4-year-old children enrolled in Head Start. Twenty-four classroom and children participated in a two-group randomized control trial, in which classrooms in the treatment condition implemented weekly…