This study explores the topic of Discourse Markers from an Interdisciplinary perspective. Applying the frameworks of Speech Act Theory, Syntax, Conversation Analysis, and Discourse Analysis, to empirical data, it answers the following important questions. What specific types of Speech Actions are performed in everyday Utterances? What Syntactic Mood & Clause Type is used to perform the various Speech Actions? What Discourse Markers occur in the Left-Periphery of the Clause? What Meaning-Functions do Discourse Markers perform? What interactions do Discourse Markers have with the various types of Speech Actions and with the Clause Type with which they are expressed? The results of this study contributed valuable insights to each of the aforementioned fields individually, as well as to the study of human language in general. Among these contributions are the following: Searle’s Taxonomy of Speech Acts was refined by dividing Representatives into Informing and Opinionating and Directives were divided into Commanding and Inquiring. The frequencies of the various Speech Acts relative to each other was identified. Furthermore, 79 distinct and specific Speech Actions were identified. The Speech Act type as well as the Clause Types with which they are expressed were identified. Among the many insights with respect to the interactions between the Speech Action Types and the Clause types with which they are expressed were each of the major Clause Types perform many different Speech Actions that are in addition to those normally attributed to them. Many of the particular Speech Acts are performed via various of the different Clause Types. The Indicative Clause type has the ability to perform most, if not all of the Speech Actions performed by all of the other Clause types. The 200 most frequently-occurring Left-Periphery Elements were identified and observations regarding their Word Class and the Meaning-Functions they perform were identified. The Meaning-Functions of the 10 most frequently-occurring Discourse Markers were identified and defined. The interactions between these Discourse Markers and the Speech Actions to which they attach as well as the Clause Types with which they are expressed were identified, thus documenting empirically that Discourse Markers are intricately connected to the Clause.