The Delphi consortium offers sponsors a Master Class just prior to the Delphi consortium meetings. Each year another topic is chosen. During this Master Class, the sponsors get an overview of the selected topic (e.g. blended acquisition, full wavefield migration, full waveform inversion) and a number of hands-on exercises are carried out. For this activity sponsors use their laptop (any laptop will be temporarily transformed into a Linux system on which the DELPHI pre-compiled software can be loaded). The class concludes by discussing a number of topic-related unsolved problems; the sense of urgency is assessed, optionally resulting in an update of the Delphi research agenda.