All symposiums were held from November 28-30, 2011 at the 2011 MRS Fall Meeting in Boston, Massachusetts. Symposium TT, 'Microelectromechanical Systems - Materials and Devices V' explored the fabrication, integration, characterisation and application of small-scale electromechanical, thermal, magnetic, fluidic and optical sensors and actuators. The scope of this multidisciplinary symposium emphasised efforts ranging from fundamental research to implementation in industry. Symposium II, 'BioMicroElectroMechanical Systems - Materials and Devices' explored the design, fabrication and applications of micro and nanoscale technologies for biomedical applications. Symposium HH covered 'Bioelectronics - Materials, Properties, and Applications'. The seven sub-sections span a wide range of topics, including fundamental charge transport at the single-molecule level, new sensors and sensor materials, cellular bioelectronics and energy harvesting biomaterials and devices.