Even thought Architecture and building construction have things in common, like need to undenstand the material, elements and components for building, they are different. Ching explains that architecture is not only about the building, but also about scale, proportions, functional zoning according to purpose and use, and the building as an integrated component within nature and build environment. Structural System was designed and built to support and transit applied load vertically and horizontally. Enclosure system is the roof, exterior walls, doors and windows that provide shelter from weather, control of heat, moisture, air and privacy. Mechanical System provides services to a building that includes water supply, sewage disposal and electricity.