During the next European Microwave Week 2018, to be held in Madrid, Spain, on September 23rd-28th, a workshop on GaN HEMT Characterization and Modeling for micro- and mm-Wave Power Amplifier Applications will be organised, featuring many iteresting topics related to MiGaNSOS. GaN/Si and GaN/SiC will be focused, with particular emphasis on characterisation and modelling strategies.