<p>Structure and Function of Argument: Introduction to Critical Thinking is a free online course on edX from Harvard University (HarvardX). It explores the underlying structures of everyday arguments and gives learners tools to recognise, analyse and construct reasoned claims — whether in writing, speaking or everyday debate.</p><ul><li>No prerequisites; introductory-level course open to anyone.</li><li>Approximately 2-3 hours per week over 8 weeks, self-paced.</li><li>Includes dynamic practice exercises in argument mapping, along with readings and short assessments.</li><li>Free to audit on edX; a verified HarvardX certificate is available for USD 209.</li></ul><p>Enrol through edX by creating a free account and selecting the HarvardX Structure and Function of Argument course.</p>