EWM is a network. Its biennal general Assembly takes place during its general meeting.
The standing committee, with its convenor and deputy convenor, organizes the activitivies between two General Assemblies.
There are coordinators, basically one in each european country. Their role is to advertise EWM initiatives, to develop activities in their country and to report on them to the network.
The scientific committee, in common to EWM and EMS plays a key role in the definition of EWM scientific activities, such as, for example, suggestions of EMS lecturers, or propositions of invited lecturers at EWM meetings.
More details in the statutes and in a text presenting the various organizations for Women in Mathematics in Europe.