The Chief shall establish criteria for selecting a firm for each project. 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 services completed, reliability and continuity of the firm and/or subcontractors, and location. Such factors shall be weighted by the Chief according to the nature, complexity, and special requirements of the project.