<p>This is the first English-language guidebook geared at an interdisciplinary audience that reflects relevant scholarly developments related to the legacy and legitimacy of&nbsp;Ferdinand de Saussure's&nbsp;<i>Course</i>&nbsp;<i>in General Linguistics&nbsp;</i>(1916) today. It critically assesses the relation between materials from&nbsp;the<i> Course</i>&nbsp;and from the linguist���s <i>Nachlass</i> (works unpublished or even unknown at Saussure���s death some of them recently discovered). This book pays close attention to the set of oppositional pairings: the signifier and the signified <i>la langue</i> (language system) and la parole (speech) and synchrony and diachrony that became the hallmark of structuralism across the humanities. Sometimes referred to as the ���Saussurean doctrine��� this hierarchical conceptual apparatus becomes revised in favor of a horizontal set of relations which co-involves speaking subjects and linguistic structures. This book documents the continued relevance of Saussure���s linguistics in the 21<sup>st</sup> Century and it sheds light on its legacy within structuralism and phenomenology.&nbsp;The reader can consult the book on its own or in tandem with the 1916 <i>Course</i>. </p>