The Director shall establish criteria which will comprise the basis for selection for each contract. The criteria shall include such factors as professional excellence, demonstrated competence, specialized experience of the firm, education and experience of key personnel to be assigned, staff capability, workload, ability to meet schedules, nature and quality of completed work, reliability of the firm, location, and other considerations deemed relevant. Such factors shall be weighed by the Director according to the nature of the contract, the needs of the State and complexity and special requirements of the specific contract for which the services will be provided.