This document discusses Industrialized Building System (IBS) and HC Precast System. It notes that IBS aims to speed up construction and decrease dependence on heavy site work. However, some precast manufacturers only use limited precast elements like beams and columns, still requiring significant brick wall assembly. HC Precast System provides a complete precast building system with load-bearing walls, beams, and stairs that minimizes on-site work. It can produce wall panels with any openings needed without relying on conventional brick walls.