Chapter Headings. The Zeolite Scene (Th.L.M. Maesen, B. Marcus). Zeolites and Molecular Sieves. An Historical Perspective (E.M. Flanigen). Zeolite Structures (L.B. McCusker, C. Baerlocher). How to Build Zeolites (H. van Koningsveld). The Preparation of Oxide Molecular Sieves, A. Synthesis of Zeolites (J.C. Jansen). B. Phosphate-Based Molecular Sieves (St.T. Wilson). Secondary Synthesis Methods (R. Szostak). Clays: from Two to Three Dimensions (R.A. Schoonheydt, K.Y. Jacobs). Techniques of Zeolite Characterization (A. Jentys, J.A. Lercher). Solid State NMR Spectroscopy applied to Zeolites (G. Engelhardt). Introduction to Zeolite Theory and Modelling (R.A. van Santen et al.). Ion Exchange in Zeolites (R.P. Townsend, E.N. Coker). Diffusion in Zeolite Molecular Sieves (D.M. Ruthven, M.F.M. Post). Adsorption of Gases in Zeolite Molecular Sieves (L.V.C. Rees, D. Shen). Introduction to Acid Catalysis with Zeolites in Hydrocarbon Reactions (J.A. Martens, P.A. Jacobs). Preparation of Zeolite Catalysts (H.W. ouwenhoven, B. de Kroes). Coke Formation on Zeolites (H.G. Karge). Hydrocarbon Processing with Zeolites (I.E. Maxwell, W.H.J. Stork). Zeolites and Related Materials in Organic Syntheses. Bronsted and Lewis Catalysis (W.F. Holderich, H. van Bekkum). Metal Ions associated to Molecular Sieve Frameworks as Catalytic Sites for Selective Oxidation Reactions (G. Bellussi, M.S. Rigutto). Zeolite-based Supramolecular Assemblies (D.E. de Vos, P.A. Jacobs). The use of Bulky Molecules as Probes for Investigating the Contributions of the External and Internal Pore-wall Activities of Zeolite Catalysts (P.J. Kunkeler et al.). Beyond Twelve Membered Rings (E.T.C. Vogt et al.). Appendix. Keyword Index.