DiALoG stands for Diagnosing the Argumentation Levels of Groups. It is designed for teachers to formatively assess the quality of evidence-based arguments and to guide the selection of instructional responses designed to Improve the quality of students’ arguments. DiALoG assesses two important aspects of group argumentation – how well students construct their own evidence-based arguments (the INTRApersonal) and how well students are able to reconcile differences with others to co-construct meaning (the INTERpersonal). The DiALoG system includes the DiALoG tool itself, along with the accompanying Responsive Mini Lessons (RMLs) and User Guides (UGs).