Subcontracts deviate from the principle that all tasks have to be fulfilled by the consortium itself. Subcontracts shall only be concluded for certain services that cannot be accomplished by the project partners but that are important for the project implementation. This shall not concern core tasks of the consortium.
In subcontracting the best price/performance ratio has to be kept in mind. In case of public authorities the respective internal regulations for the selection of a service provider shall apply; private enterprises have to obtain at least three offers.