Translating and analyzing library activity: new tools and changes in evaluation practices. A joint interview with Odile Jullien Cottart and Cécile Touitou • While libraries have a long tradition of evaluation, this activity has remained current with practices that are evolving. It is worth mentioning the recent work of the Afnor/CN 46-8 commission "Information and documentation - Quality, statistics and evaluation of results" presented during the one-day conference on May 21, 2021. Evaluation in libraries remains a vital subject which continues to develop in response to the multiplication of exploitable data sources, the different expectations held by governments and users, and the evolution of professionals' skills. Odile Jullien Cottart and Cécile Touitou give us their analysis of the challenges of evaluation in libraries.