Here we could expand saying that for example in REINFORCE we have detector characterization projects (e.g GWitchHunters) and event reconstruction projects (e.g New Particle Search at CERN), each with its own merits. The topic itself may be difficult, or the tasks may be difficult to implement. On the other hand the topic may be very appealing (e.g Astronomy) and/or the tasks may be presented in a dedicated interface that makes them engaging for the public. We would like to point to sections 4 and 5 of D8.3 for a relevant discussion.