Building and Construction
Knowledge of materials, methods, and the tools involved in the construction or repair of houses, buildings, or other structures such as highways and roads.
Mechanical
Knowledge of machines and tools, including their designs, uses, repair, and maintenance.
Engineering and Technology
Knowledge of the practical application of engineering science and technology. This includes applying principles, techniques, procedures, and equipment to the design and production of various goods and services.
Mathematics
Knowledge of arithmetic, algebra, geometry, calculus, statistics, and their applications.