Bob Miyamoto         Principal Physicist         Applied Physics Laboratory         University of Washington	Researchers are evaluating the development of the new Tactical Acoustic Measurement and Decision Aid (TAMDA) system and making recommendations for substantive improvements to operational Air ASW effectiveness. APL-UW lends direct support to the Extended Echo Ranging (EER) Improvement Program. Specifically, APL-UW is conducting and coordinating research to understand how oceanic properties and conditions affect the performance of acoustic systems through technical support of air ASW platform, system, and sensor development, including visions and plans (i.e., Air ASW Master Plan/ Concept of Operations) for integration with other ASW assets in various conflict scenarios. We are developing the ASW concept of operations for joint force operations with particular emphasis on complex littoral environments; developing recommendations for improving the use of historical and experimental data to verify and improve the models and databases used for engineering development of the TAMDA system. To further support Air ASW, APL-UW is conducting an analysis on the EER reconstruction, providing feedback to mission planners through improvements to databases, modeling, and algorithms.