This document discusses argumentation in students' academic writing. It summarizes that previous models of argument analysis focused on persuasion, but academic arguments can serve multiple purposes including justification and inquiry. The author proposes an alternative framework to analyze student writing that accounts for rational, rhetorical and dialectical aspects of arguments and the diversity of practices across cultures. The framework identifies three potential functions of academic arguments: persuasion, justification of claims, and inquiry to evaluate positions without commitment. This recognizes that academic arguments are not solely aimed at persuasion.