The provided text includes several errata and updates for publications in Acta Cryst. (1983), focusing on corrections to equations and intensity distributions in X-ray diffraction studies of nonstoichiometric titanium sulfide containing stacking faults. Additionally, it announces appointments and updates regarding the International Union of Crystallography, including the appointment of Professor A. J. C. Wilson as Chairman of the Commission on International Tables and the preparation of a revised edition of the tables of symmetry groups. The text also mentions the publication of a volume on crystallographic statistics from the Twelfth International Congress of Crystallography, and book reviews, including a collection of papers on nonlinear phenomena at phase transitions and instabilities.The provided text includes several errata and updates for publications in Acta Cryst. (1983), focusing on corrections to equations and intensity distributions in X-ray diffraction studies of nonstoichiometric titanium sulfide containing stacking faults. Additionally, it announces appointments and updates regarding the International Union of Crystallography, including the appointment of Professor A. J. C. Wilson as Chairman of the Commission on International Tables and the preparation of a revised edition of the tables of symmetry groups. The text also mentions the publication of a volume on crystallographic statistics from the Twelfth International Congress of Crystallography, and book reviews, including a collection of papers on nonlinear phenomena at phase transitions and instabilities.