++++ 1 . Approximation of laws - Procedure for the award of public works contracts - Directive 71/305 - Scope - Contracts awarded by a body which falls within the notion of the State although it is not formally part of the State administration - Included ( Council Directive 71/305, Art . 1 ) 2 . Approximation of laws - Procedure for the award of public works contracts - Directive 71/305 - Technical ability and knowledge of tenderers - Criteria for checking - Award of contracts - Most economically advantageous tender - Condition concerning employment of long-term unemployed persons - Permissibility - Conditions - Publicity requirements - Direct effect of Articles 20, 26 and 29 of the directive ( Council Directive 71/305, Arts 20, 26 and 29 ) 3 . Measures adopted by the institutions - Directives - Implementation by the Member States - Need to ensure effectiveness of directives - Obligation of national courts ( EEC Treaty, Art . 5 and Art . 189, third paragraph ) 4 . Measures adopted by the institutions - Directives - Direct effect ( EEC Treaty, Art . 189, third paragraph )