Students discover the best way to build structurally sound buildings and bridges using this kit. They begin by learning the basics of architectural design and how buildings support weight. After building a house and pyramid, they move to various types of bridges. Comprehensive instructions in the included booklet show students how to build a basic arch bridge and explain the importance of the keystone. They also learn how trusses and cables work to elevate bridges. Kit includes 191 pieces for 9 models. Recommended for Elementary and up.