Full Membership: Open to individuals with six or more years' experience in a skill or skills recognised by the Committee under clause (a) above. They have normal voting rights, are eligible for nomination for election to the Committee and to nominate others. They may use the initials SAI after their name. Sponsorship by two full Members, at least one of whom is from the same professional grade as the applicant, is normally required.

Associate Membership: Open to individuals with between three and six years' experience in a skill or skills recognised by the Committee under clause (a). They have normal voting rights including nominating others for election to Committee, but cannot themselves become Committee Members. Sponsorship by two full Members, at least one of whom is from the same professional grade as the applicant, is normally required.

Supplementary Membership: Open to individuals with less than three years' experience in a skill or skills recognised by the Committee under clause (a). They have no voting rights. In the case of trainees, a supporting letter from their employer or trainer may be necessary.  Sponsorship by two full Members, at least one of whom is from the same professional grade as the applicant, is normally required.

Honorary Membership: Extended to those who have retired from the Industry on invitation by the Committee.