An Owner-builder will be measured the principal outworker if the owner-builder takes on the role of managing the construction work to the scope that the owner-builder is in control of the building work. In this event, the owner-builder will be bound by the regulations applying to the principal contractor. Construction engineering concerns the development and supervision of the construction of structures such as highways, bridges buildings, dams, airports, railroads, and reservoirs. Construction of such projects requires knowledge of development and management principles and business procedures, economics, and human behavior.