Preface. Part I: Active Vision: V. Cantoni, G. Caputo, and L. Lombardi, Attentional Engagement in Vision Systems. Y. Yeshurun, Attentional Mechanisms in Computer Vision. M. Savini, The Active Vision Idea. E. Trucco, Active Model Acquisition and Sensor Planning. A. Verri, The Regularization of Early Vision. Part II: Integrating Visual Modules: M. Bertolotto, E. Bruzzone, and L. DeFloriani, Geometric Modeling and Spatial Reasoning.V. Roberto, Vision as Uncertain Knowledge. V. Di Gesu and D. Tegolo, Distributed Systems for Fusion of Visual Infomation. E. Ardizzone, A. Chella, and S. Gaglio, Hybrid Computation and Reasoning for Artificial Vision. Part III: VisualCommunication: A.M. Iacono, Illusion and Difference. S. Levialdi, P. Mussio, N. Bianchi, and P. Bottoni, Computing with/on Images. A. Del Bimbo, Visual Databases. S-K. Chang, Visual Languages for Tele-Action Objects. Subject Index.