Purpose of Agitator Design -- Major Steps in Successful Agitator Design -- Agitator Fundamentals -- Agitator Behavior under Gassed Conditions -- Impeller Types Used in Fermenters -- Impeller Systems -- Piloting for Mass Transfer -- Power and Gas Flow Design and Optimization -- Optimizing Operation for Minimum Energy Consumption per Batch -- Heat Transfer Surfaces and Calculations -- Gasses Other Than Air and Liquids Other Than Water -- Viscous Fermentation -- Three Phase Fermentation -- Use of CFD in Fermenter Design -- Agitator Seal Design Considerations -- Fermenter Agitator Mounting Methods -- Mechanical Design of Fermenter Agitators -- Sanitary Design -- Aspect Ratio -- Vendor Evaluation -- International Practices.