Since 2014 CERN, organises Beamline for Schools (BL4S), a worldwide annual competition for high-school students. Teams of students apply with a proposal for a physics experiment at the CERN PS 10GeV/c secondary beam line, and two groups are selected and invited to CERN to perform their experiments using state of the art detectors and data taking systems. Being part of all stages of an experiment, from proposal and design, over data taking to data analysis and publication of results, the teams get a broad picture of being an experimental physicist. During all stages, the students are supported by a small on-site team that implements the proposed experiments and supervises data taking and analysis.
I will discuss the concept and experiences gained during four editions of BL4S including technological and communication aspects as well as the impact of the program on participating teams.