1. Where the criterion for award is that of the most economically advantageous tender, contracting authorities/entities may authorise tenderers to submit variants.

2. Contracting authorities/entities shall indicate in the contract notice whether or not they authorise variants. Variants shall not be authorised without this indication.

3. Contracting authorities/entities authorising variants shall state in the tender specifications the minimum requirements to be met by the variants and any specific requirements for their presentation.

Only variants meeting the minimum requirements laid down by the contracting authorities/entities shall be taken into consideration.

4. In procedures for awarding supply or service contracts, contracting authorities/entities which have authorised variants may not reject a variant on the sole ground that it would, if successful, lead either to a service contract rather than a supply contract, or to a supply contract rather than a service contract.