Text is highly structured, and structured at a variety of levels. But what are the units of text, which levels are at stake, and what establishes the structure that binds the units together? This volume, just as the predecessor a spin off of one of the workshops on constraints in discourse, contains the most recent reviewed papers by specialists in the area that try to give answers to such questions. It helps deepening the understanding of a multiplicity of mechanisms and constraints that are at work during production and comprehension of well-formed discourse.