I. Geotectonic Concepts. 1. Diapiric krikogenesis (S.W. Carey). 2. Arcuate crustal structures (V.V. Beloussov). 3. Regularities in the pattern of major fault zones of the earth and the origin of arcs (N. Pavoni). 4. Global neotectonics, arcs and geoid configuration (N.-A. Mörner). II. Geophysics and Geochemistry. 1. Evidence of a deep-reaching lithospheric root under the Alpine Arc (S. Mueller, G.F. Panza). 2. On the dynamics of convergent plate boundaries and stress in the lithosphere (M.J.R. Wortel, S.A.P.L. Cloetingh). 3. Paleomagnetism in arcuate mountain belts (W. Lowrie, A.M. Hirt). 4. Geochemical and isotopic systematics of Eastern Sunda Arc volcanics: Implications for mantle sources and mantle mixing processes (R. Varne, J.D. Foden). III. The Alpine-Mediterranean Region. 1. Mechanism of formation of fold belts: The Alpine-Carpathian region (E.V. Artyushkov, M.A. Baer). 2. The western Alpine arc: New data and hypothesis (J. Debelmas). 3. Southalpine versus Po Plain Apenninic arcs (A. Castellarin, G.B. Vai). 4. Betic-Rifian and Tyrrhenian arcs: Distinctive features, genesis and development stages (J.-P. Bouillin et al.). 5. Neotectonics of the Calabrian arc and Apennines (Italy): An example of Plio-Quaternary evolution from island arcs to collisional stages (J.C. Bousquet, H. Philip). 6. Event stratigraphy, basin evolution and tectonics of the Hellenic and Calabro-Sicilian arcs (J.E. Meulenkamp, F.J. Hilgen). 7. Tyrrhenian volcanic arcs: Volcano-tectonics, petrogenesis and economic aspects (E. Locardi). IV. The Caribbean. 1. Growth of accretionary prisms tectonic processes from Caribbean examples (A. Mascle et al.). 2. Northern and southern Caribbean festoons (Panama, Colombia-Venezuela and Hispaniola-Puerto Rico), interpreted as pseudosubductions induced by the east-west shortening of the Pericaribbean continental frame (J.F. Stephan et al.). V. The Pacific.