Rise, become popular and be forgotten: that is the fate of any file format. Want to learn how to make predictions about the lifecycle of file formats in an e-repository? And how do you know which stage of this life cycle your files are in? In this workshop, DANS-er Valentijn Gilissen will take you through the results of the study Monitoring Obsolete File Formats. You will also get to work with the results yourself. The workshop, given in Dutch, is free but registration is required.