The 15th Call for Proposal for PRACE Project Access is now open until 30 May 2017, 10:00 CEST. It is now possible to submit a proposal for PRACE under the defined guidelines, and apply for one of the supercomputers of the affiliated european HPC centers, including our MARCONI. Proposals can be based on a 12-months schedule, or, for Multi-year Projects, on a 24- or 36-months schedule.