Observations of lightning have always had, and continue to have, a strong influence on our physical understanding of atmospheric electricity. The instruments used to make the observations have been varied, including optical cameras, radio receivers, microphones, particle detectors, rockets, lasers, and more. As technology has progressed, the volumes of data these instruments now produce can be quite breathtaking, requiring processing techniques to reduce the data into a form useful for scientific endeavors. Improved signal processing techniques have also been used to extract more and more information from the data. This session focuses on recent developments of instrumentation used to observe lightning and transient luminous events (TLEs) as well as the signal and data processing techniques that accompany them. Topics include but are not limited to; atmospheric electricity measurement instrumentation of all types; data processing methods to locate, map, or image lightning; signal enhancement techniques, and wave propagation models.