In this reading, Ching talks about structural units, spans, patterns lateral stability, and how they are put together. Ching states that by combining several structural units like slabs, girders, beams, and joists, we can make a basic place for habitat that can resist not only the loads placed on it but also the different weather and climatic conditions. However, depending on the material you use, and the spaning systems (one way or two-way), Timber, steel, or Reinforced concrete, different systems will be used. in order to have the structural stability, the structural system must be designed to not only carry vertical loads, but to also withstand strong winds, and forces from any direction.