This project team developed a prototype of the Online Socratic Learning for Enhanced Critical Thinking, an online intervention in which 5th grade social studies students are posed with a hypothetical situation through a case study and then asked to create an argument to support a position. The software is designed to automatically pose a counter-argument. The goal of the intervention is to increase students' critical thinking and argument skills with topics relevant to standards in social studies. The intervention will include teacher professional development and support. During Phase I, the research team successfully developed a prototype of the intervention.