A challenge can be defined as a common objective of the partners of the project that implies the connection of different activities and work-packages. A challenge is decided in a general assembly of the project and should be precisely defined in terms of responsibilities (who is the coordinator), partnership (which researchers are involved), agenda (what are the estimated delay of realization) and concrete outputs (what are the deliverables expected). In all cases, a challenge should stick to the objectives envisaged, the ESPON space and the geography to be covered by the ESPON 2013 Database .
