This book offers new perspectives into the description of the form, meaning and function of Pragmatic Markers, Discourse Markers and Modal Particles in a number of different languages, along with new methods for identifying their?prototypical? instances in situated language contexts, often based on cross-linguistic comparisons. The papers collected in this volume also discuss different factors at play in processes of grammaticalization and pragmaticalization, which include contact-induced change and pragmatic borrowing, socio-interactional functional pressures and sociopragmatic indexicalities, constraints of cognitive processing, together with regularities in semantic change. Putting the traditional issues concerning the status, delimitation and categorization of 'Pragmatic Markers, Discourse Markers and Modal Particles' somewhat off the stage, the eighteen articles collected in this volume deal instead with general questions concerning the development and use of such procedural elements, explored from different approaches, both formal and functional, and from a variety of perspectives -- including corpus-based, sociolinguistic, and contrastive perspectives -- and offering language-specific synchronic and diachronic studies.