A comprehensive and accessible introduction to standards elements of critical thinking that provides rules for the etiquette and ethics of good reasoning and assessing and organizing sound arguments. It addresses anyone who wants to use reasons and evidence in support of conclusions; to be clear, not confusing; be persuasive, not dogmatic; and learn to evaluate arguments in both verbal and written, in personal and public discourse. The author simply and carefully develops ideas, step by step allowing the reader to develop their own interpretive skills, verification skills, and reasoning skills along the way. An enlightened society, book argues, is only possible if students develop critical thinking. This book is the first one of its kind in Farsi.