Regular Membership shall be obtained only by invitation of the Council and subject to approval by the General Meeting. The total membership of the Collegium shall be restricted to a limit set by the General Business Meeting. The limit of 250 Regular members has been set in 1986 and is subject to revision if required.
Corresponding Membership shall be obtained upon retirement or when a member reaches the age of 70 they shall be appointed Corresponding Member and retain all the rights and privileges of regular membership but their place becomes available for the election of new members.
Lifetime Membership shall be available to previous CIA members in good standing who have retired from the scientific community and shall be nominated by members of the Council and subject to approval by the General Meeting. Lifetime members will received waived membership dues, certificate of membership and an invitation to attend the Biennial Symposium.