The workshop aims at bringing together scientists and engineers working in the field of longitudinal diagnostics for future accelerators to strengthen close collaborations in the fields of longitudinal beam instrumentation, detector development and data acquisition. Apart from the first session on the status of the facilities, all sessions are organised as ‘Speed Poster Sessions”: Authors are asked to present their contributions as a poster, size ISO A0; before the session, each author may ‘advertise' his/her poster with a few slides (max. 4 minutes). Coffee will be available during the poster sessions; each session will end with a discussion and summary block. The sessions topics are: Electro-optical diagnostics, coherent radiation diagnostics, MHz line detector development and special topics.