The European commission relies on external and international experts panels to assess all of the projects submitted to Brussels for funding. During FP7 individual evaluators have to register on an online database. Once they are registered their application is processed and they are eventually selected for one or more panels.
The Commission calls this database a database of prospective independent experts. Once registered the evaluator will be selected in compliance to the commission’s internal rules. But the evaluator will have an active role on a panel only if applications in the particular calls are relevant to his/her expertise, if there are sufficient applications etc. On a panel, the expert will be flown to Brussels for the meetings.
Final notes: