SELECTION OF SUPPLIERS The method for the selection of suppliers awarded contracts is based on the following major categories: ■ Tender contracts for core activities of values higher than EU thresholds, which are entrusted through a European public call for tenders, with tender publication or public notice of the qualification system; ■ Core activity contracts with values below EU thresholds or non-core contracts of any values, which are governed by SEA’s internal ‘Procurement Procedure’.