Discourse markers constitute an important part of linguistic communication, and research on this phenomenon has been a thriving field of study over the past three decades. However, a problem that has plagued this research is that these markers exhibit a number of structural characteristics that are hard to interpret based on existing methodologies, such as grammaticalization. This study argues that it is possible to explain such characteristics in a meaningful way. It presents a cross-linguistic survey of the development of discourse markers, their important role in communication, and their...