With the growth of ESA, the Executive Committee drafted and distributed a proposal for By-laws (see link below) in 2013 (rev. 2017), based on factual decisions as they were made over many years (for conferences, publications, Research Networks, voting). Since 2013, ESA applies and respects the rules.
The proposal has not yet been on the agenda of the General Assembly. For the rules will only become effective as 'By-laws' after ESA's General Assembly has approved them (s. proposal, §12), we are currently preparing the procedure for the approval. Please send your suggestions, questions or comments on the proposal to firstname.lastname@example.org.