(Listed here are the plenary and keynote lectures only). I. Plenary Lectures. Advances in the structural analysis of zeolites, zeolitic precursors and their analogues (J.M. Thomas). Towards a comprehensive mathematical theory for the topology and geometry of microporous materials (J.V. Smith). Application of zeolites in fluid catalytic cracking and related processes (A. Corma). Zeolites: catalysts for the synthesis of organic compounds (W.F. Hölderich). New zeolites and other microporous materials (D.E.W. Vaughan). II. Synthesis and Modification. Are the general laws of crystal growth applicable to zeolite synthesis? (F. Di Renzo et al.). Applications of MAS-NMR spectroscopy to the study of faujasites synthesis (D.M. Ginter et al.). Synthesis of aluminophosphates and element substituted aluminophosphate VPI-5 (M.E. Davies et al.). III. New Materials and Pillared Clays. The next generation: synthesis, characterization and structure of metal sulfide-based microporous solids (R.L. Bedard et al.). IV. Natural Zeolites and Utilization. V. Characterization. Multitechnique analysis of the lattice structures of highly siliceous zeolites (C.A. Fyfe et al.). VI. Structure and Theory. On the use of graphs in zeolite structural chemistry (W.M. Meier). Modelling of the adsorption of aromatics on silicalite on molecular statistical basis (B. Grauert et al.). VII. Adsorption and Diffusion. VIII. Metals in Zeolites. Design of metal clusters in NaY zeolite (S.T. Homeyer, W.M.H. Sachtler). IX. Catalysis. Reactions of electrophilic substitutions on zeolite catalysts. Aniline alkylation by methanol (K.G. Ione, O.V. Kikhtyanin). The spaciousness index: a useful catalytic method for probing the effective pore width of molecular sieves (J. Weitkamp et al.). Author Index. Keyword Index.