本会于1981年7月21—30日在加拿大安大略省伦敦城召开。全体会议于7月21日和7月30日举行。7月27日召开了一些会议期间的简短的事务性会议,并召开了一次非正式的自由参加的会议讨论协会事务。章程修改:正式事务的主要项目涉及到章程修改。这次会议后准备做过多的修改,不过一些不合理的章程必须取消,并在最后一次大 The Society was held on July 21-30, 1981 in London, Ontario, Canada. Plenary sessions are held on July 21 and July 30. On 27 July, a brief briefing session was held during the meeting and an informal free-for-charge meeting was held to discuss the affairs of the association. Article changes: the main items of formal affairs related to the constitution changes. After this meeting to prepare too many changes, but some unreasonable constitution must be canceled, and in the last big