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Article 58 of that directive, which is headed ‘Selection criteria’, provides: ‘1. Selection criteria may relate to: (a) suitability to pursue the professional activity; (b) economic and financial standing; (c) technical and professional ability. Contracting authorities may only impose criteria referred to in paragraphs 2, 3 and 4 on economic operators as requirements for participation. They shall limit any requirements to those that are appropriate to ensure that a candidate or tenderer has the legal and financial capacities and the technical and professional abilities to perform the contract to be awarded. All requirements shall be related and proportionate to the subject matter of the contract. 2. With regard to suitability to pursue the professional activity, contracting authorities may require economic operators to be enrolled in one of the professional or trade registers kept in their Member State of establishment, as described in Annex XI, or to comply with any other request set out in that Annex. In procurement procedures for services, in so far as economic operators have to possess a particular authorisation or to be members of a particular organisation in order to be able to perform in their country of origin the service concerned, the contracting authority may require them to prove that they hold such authorisation or membership. 3. With regard to economic and financial standing, contracting authorities may impose requirements ensuring that economic operators possess the necessary economic and financial capacity to perform the contract. For that purpose, contracting authorities may require, in particular, that economic operators have a certain minimum yearly turnover, including a certain minimum turnover in the area covered by the contract. In addition, contracting authorities may require that economic operators provide information on their annual accounts showing the ratios, for instance, between assets and liabilities. They may also require an appropriate level of professional risk indemnity insurance. The minimum yearly turnover that economic operators are required to have shall not exceed two times the estimated contract value, except in duly justified cases such as relating to the special risks attached to the nature of the works, services or supplies. The contracting authority shall indicate the main reasons for such a requirement in the procurement documents or the individual report referred to in Article 84. The ratio, for instance, between assets and liabilities may be taken into consideration where the contracting authority specifies the methods and criteria for such consideration in the procurement documents. Such methods and criteria shall be transparent, objective and non-discriminatory. Where a contract is divided into lots this Article shall apply in relation to each individual lot. However, the contracting authority may set the minimum yearly turnover that economic operators are required to have by reference to groups of lots in the event that the successful tenderer is awarded several lots to be executed at the same time. Where contracts based on a framework agreement are to be awarded following a reopening of competition, the maximum yearly turnover requirement referred to in the second subparagraph of this paragraph shall be calculated on the basis of the expected maximum size of specific contracts that will be performed at the same time, or, where it is not known, on the basis of the estimated value of the framework agreement. In the case of dynamic purchasing systems, the maximum yearly turnover requirement referred to in the second subparagraph shall be calculated on the basis of the expected maximum size of specific contracts to be awarded under that system. 4. With regard to technical and professional ability, contracting authorities may impose requirements ensuring that economic operators possess the necessary human and technical resources and experience to perform the contract to an appropriate quality standard. Contracting authorities may require, in particular, that economic operators have a sufficient level of experience demonstrated by suitable references from contracts performed in the past. A contracting authority may assume that an economic operator does not possess the required professional abilities where the contracting authority has established that the economic operator has conflicting interests which may negatively affect the performance of the contract. …’