A large part of the Commission membership had the opportunity to meet in Seattle. Future activities of the Commission for the next triennum were defined. These include: (i) coordination with other IUCr Commissions to set up standards for the publication of aperiodic crystal structures; (ii) coordination with organizations responsible for the creation of structural databases dealing with aperiodic crystal structures; (iii) coordination with organizers of various international conferences specialising in the field of quasicrystals.

Members of the Commission also had the opportunity to meet during various international meetings with the purpose of coordinating or preparing conference programmes on topics dealing with aperiodic structures (Lisbon, Portugal, March 1996, for the preparation of ECM-17; Cracow, Poland, July 1996, during the Workshop on Aperiodic Structures). The Chairman of the Commission was actively involved with the organizers of Aperiodic'97 for the preparation of the meeting which will take place in Alpe d'Huez (France) in August 1997.

The work on the checklist for the publication of incommensurate crystal structures has been completed and the document published in Acta Cryst. (1997) A53, 95-100. Following this publication, the Commission has launched initiatives with various contact persons responsible for the structure or content of crystallographic databases in order to establish standards regarding the publication of aperiodic structures. This work will be pursued as a priority in future activities of the Commission.

Gervais Chapuis