Introductory Lecture.- 1. Transducer Needs for Low-Frequency Sonar.- 2. Transducer Needs for Oceanography.- 3. Transducer Needs for Petroleum Acoustics.- 4. Transducer Needs for Macrosonics.- 5. Class IV Flextensional Transducers.- 6. The Ring-Shell Flextensional Transducer (Class V).- 7. Transducers for Great Depths.- 8. Physics of Array Element Interaction Phenomena.- 9. Numerical Modeling of Array Interactions.- 10. Magnetostrictive Materials.- 11. Modeling and Characterization of the Magnetostrictive Coupling.- 12. A Magnetostrictive Transducer Design.- 13. Magnetohydrodynamic and Thermoacoustic Mechanisms for Generation of Sound in Seawater.- 14. A Low-Frequency, Tow-Powered Sound Source.- 15. Electronic Needs for High-Power Transducers.- 16. Electronic Systems Modeling.- 17. Calibration of Underwater Acoustic Transducers at NRL/USRD.- 18. Measurement Methods for Low-Frequency Transducers.- 19. Poster Session Abstracts.