3) background knowledge: as well as the "corals-effect-on-the-ferryboat case" we tried to provide real numbers supporting the reasoning about hens and eggs. We invented statistics and authors. On the contrary we had many many difficulties to elaborate our final hypothesis because of lack of information. Some of the groups listed the main relevant subjects of interest instead of writing down real information. I admit the main topics were absolutely correct but not informative enough for keep "playing" the game.