This document provides step-by-step instructions for assembling a desktop computer system unit. It begins with preparing the work area and taking inventory. It then outlines 10 steps: installing the IO shield and power supply, attaching motherboard components like the CPU and RAM, installing the motherboard, expansion cards, internal drives, and internal cables. The last steps are reattaching the side panels and connecting external cables. The overall goal is to assemble the computer components in a logical, methodical manner.