Exploring philosophy through detailed argument analyses of texts by philosophers from Plato to Strawson using a novel & transparent method of analysis The best way to introduce students to philosophy & philosophical discourse is to have them read & wrestle with original sources This textbook explores philosophy through detailed argument analyses of texts by philosophers from Plato to Strawson It presents a novel & transparent method of analysis that will teach students not only how to understand & evaluate philosophers' arguments but also how to construct such arguments themselves Students will learn to read a text & discover what the philosopher thinks why the philosopher thinks it & whether the supporting argument is good Students learn argument analysis through argument diagrams with color-coding of the argument's various elements -- conclusion claims & "indicator phrases" (An online "mini-course" in argument diagramming & argument diagramming software are both freely available online) Each chapter ends with exercises & reading questions After a general introduction to philosophy & logic & an explanation of argument analysis the book presents selections from primary sources arranged by topics that correspond to contemporary debates with detailed analysis & evaluation These topics include philosophy of religion epistemology theory of mind free will & determinism & ethics; authors include Aristotle Aquinas Descartes Hume Kant Ryle Fodor Dennett Searle & others What Is the Argument? not only introduces students to great philosophical thinkers it also teaches them the essential skill of critical thinking