Book excerpt: This volume contains papers based on the main lectures, oral communications and selected posters presented at the 4th International Conference of Polymer-Solvent Complexes and Intercalates held as the 63rd meeting of Prague Meetings on Macromolecules in Prague in July 2002. Many aspects of the polymer-solvent interactions, structure and dynamics in solution, gels, solids and interfaces are discussed in detail herein. The wide scope of the presented results is evidence of the growing impact of this field on various research areas.