The document outlines the activities and collections of the Centre Iannis Xenakis (CIX) at the Université de Rouen, focusing on archiving and digitizing music research materials related to composers who utilized the UPIC system. It discusses the challenges and progress in cataloging the extensive collection of materials, including scores, audio recordings, and multimedia sources, with an emphasis on developing a suitable content management system for metadata sharing. Additionally, the document highlights the importance of preserving these archives for future musicological research and educational purposes.