Before the committee deals with the nominations, specialist non-government organisations (NGOs) assess them thoroughly to ensure that the convention’s requirements to quality, boundaries and administration are met. It means that the relevant country must commit itself to conserving the resources over a long term. The areas are monitored every sixth year to see whether the resources have deteriorated and whether changes are required in their management. Additional tourists can mean increased revenues, but at the same time the tourists can have a negative impact on the resources - for example through wear and tear.