Building design is a comprehensive process that includes architectural design, structural design, mechanical and electrical systems, and detailed execution planning. In architecture, the overall form, layouts, space planning, and aesthetics of the building are defined. In structural design, the framework and load-bearing system are determined based on engineering principles and codes. Mechanical and electrical design covers HVAC systems, plumbing, ventilation, boiler rooms, lighting, and power distribution. This process ensures that all components of the building are precisely defined and fully coordinated before construction begins.