The mixing desk of larp was at the beginning a framework for organizing your thoughts about larp design. We think that it is also a good way to explain your intentions to your players for a specific larp. You will find more information about the mixing desk of larp on the Nordic Larp wiki: http://nordiclarp.org/wiki/The_Mixing_Desk_of_Larp
This interactive tool is made by Guillaume Boît: http://www.guillaumeboit.fr