A number of companies are included in the framework that cover the range of consulting services needed. Hourly rates of different grades are part of the agreed conditions. Where it is necessary to obtain certain services within the framework of the latter, the contracting authority shall organise a mini-competition with all suppliers who are able to meet this need of the category of services necessary to determine which undertaking offers the `most economically advantageous` tender (quality/price ratio) for the respective mix of grades/tariffs required. . . .