General Electric (GE) Company will develop advanced last stage blade (LSB) turbine technology by developing rotor system designs and vibration management strategies, which are necessary to realize ~3100°F turbine inlet temperature that enables the goal of 65% combined cycle efficiency and reduces the cost of electricity. The project focuses on understanding and mitigating synchronous and nonsynchronous vibrations that limit the current state-of-the-art LSB designs and applications. Two classes of LSBs will be considered—partial span shroud configuration and a no-shroud configuration—both reduce the blade mass and open design space. Conceptual LSB designs will be extensively evaluated to assess the feasibility of a range of system architecture approaches that will lead to the down-selection of a preferred high temperature, high AN2 LSB system conceptual design. This project advances the understanding of partial span damper concepts, internal damping concepts, and other designs and strategies that will arise.