Because of the model adopted for the ECS, which is designed to enable it to react quickly to events, it is vitally important that members remain constantly involved.

At Obernai (2015) it was agreed that if a member does not participate in 3 consecutive annual meetings, or in drafting committees for two consecutive years, s/he should be considered as an inactive member. As a result, their position would become vacant. The Executive Committee will contact the inactive member and inform them of the position. The Executive Committee will invite replacement members if necessary, after agreement of the ECS plenary.