According to By-laws Art. 4 and Art. 6
Persons may be admitted as junior members if they are a scientific expert at an early stage of their academic or professional career according to Article 4, section 1. Junior membership expires after a maximum of five years and entitles the holders to become regular members without any formal application.
Article 6, Membership of the categories set out in Article 4 expires:
- on resignation, which must be notified in writing to the President, with a minimum of three months' notice to expire at the end of a calendar year. The subscription for the year, in which the resignation is tendered, is due in full
- on death (for individual members)
- on exclusion from membership, which in case of an individual and an associate member may be made by the Committee.
Members who have resigned or who have been excluded from membership have no claims of any kind on the Association.