What should a good worker know about tools, machines, computers, equipment, test scanners, etc? What calculations or math should a first class worker be able to do? What should workers know about the scientific principles of heat, combustion, mechanics, electricity, gases, light, etc? What should workers know about chemistry, hygiene, safety and the structure of the human body? What does the worker need to know about materials of his or her occupation: wood, rubber, paints, textiles, soaps, foods, materials, etc? What knowledge of drawing and plan reading, art or design is essential for their occupation? What knowledge of trade/occupation terms and reference materials should the worker have