The Knowledge of machines and tools, including their designs, uses, repair, and maintenance, materials, methods, and the tools involved in the construction or repair of houses, buildings, or other structures such as highways and roads, the structure and content of the English language including the meaning and spelling of words, rules of composition, and grammar, design techniques, tools, and principles involved in production of precision technical plans, blueprints, drawings, and models, principles and processes for providing customer and personal services. This includes customer needs assessment, meeting quality standards for services, and evaluation of customer satisfaction.