Introduction (G. Rickheit, C. Habel). Part I: Fundamentals of Mental Models: Mental models. Some answers, some questions, some suggestions (G. Rickheit, L. Sichelschmidt). What's in a mental model? (A. Garnham). What are mental models made of? (A.J. Sanford, L.M. Moxey). Why mental models must be embodied (A. Glenberg). Part II: Mental Models in Discourse Processing. Taking the functional aspect of mental models as a starting point for studying discourse comprehension (B. Kaup et al.). Cognitive aspects of coordination processes (G. Rickheit, H. Wrobel). Task-dependent construction of mental models as a basis for conceptual change (W. Schnotz, A. Preu&bgr;). Grounding mental models – subconceptual dynamics in the resolution of linguistic reference in discourse (K. Kessler et al.). On the duality and on the integration of propositional and spatial representations (C. Freksa, T. Barkowsky). Cognitive modelling of vision and speech understanding (B. Hildebrandt et al.). Part III: Mental Models in Reasoning and Problem Solving. Mental models of spatial relations and transformations from language (B. Tversky et al.). A semantics for model-based spatial reasoning (J. Glasgow, A. Malton). Mental models in deductive, modal, and probabilistic reasoning (P. Tabossi et al.). The construction of preferred mental models in reasoning with interval relations (C. Schlieder). Parts and wholes and their relations (S. Pribbenow). Concessives and mental models (R. Klabunde). Authors. Author index. Subject index.