Knowledge Skills Abilities: Considerable knowledge of methods, materials, and practices used in building service work, and the proper use and care of mops, brooms, scrubbing brushes, waxing machines, and related equipment; working knowledge of the safe efficient procedures for operating central heating plants and the ability to make minor adjustments and service repairs to the equipment. Ability to work with students, teachers, school leadership staff and the general public demonstrating these core competencies described in the Supporting Services Professional Growth System: commitment to students, knowledge of job, professionalism, interpersonal, communication and organization skills, and problem solving competencies.