Tailored Polymers from Single-Site Catalysts§Advances in Traditional Heterogneous Catalysts§Process Requirements and Polymer Particle Growth§Aluminoxane Activated Catalysts on Inorganic Oxides§Perfluoroaryl Group 13 Activated Catalysts on Inorganic Oxides§Catalysts Supported on Magnesium Chloride.§Polymerizations with Single-Site Catalysts Entrapped inside the Nanospace of Mesoporous Materials and Clays§Supported Superacid Catalysts§Olefin Polymerization Catalysts and Cocatalysts to Inorganic Oxides§Multi Component Catalytic Systems§Polymer Supported Catalysts§Self-Immobilizing Catalysts and Co-catalysts