The RadioNet Joint Research Activity RINGS (Radio Interferometry Next Generation Software) meets at the Max Planck Institute for Radio Astronomie in Bonn on February 19, 2018. RINGS partners from MPG, ASTRON, JIV-ERIC, UMAN, OSO, and DIAS start the work on the main objective for RINGS: To deliver advanced calibration algorithms for the next generation of radio astronomy facilities, characterized by a high sensitivity, a high bandwidth and long baselines.