Feature models were invented in 1990 and have been recognised as one of the main contributions to the Software Product Line community. Although there have been several attempts to establish and study a sort of standard variability modelling language, there is still no consensus on a simple feature modelling language. There can be many motivations to have one but among others, there is one that is very important: information sharing among researchers, tools and developers. Following the spirit of the four previous editions, this workshop is an interactive event where all participants share knowledge, but also ongoing realizations about how to build up a feature modelling language that all the community can agree on.