Before designing systems that evolve, scale, or coordinate, one must first understand what makes a unit real. A unit is not a team, a project, or a platform module—it is a structured sociotechnical entity: a composition of physical crafts, digital crafts, and, above all, crews. Each unit exists as a coherent vessel of purpose—its physical craft providing protection and integrated tools, its digital craft enabling computation, communication, and coordination, and its crew interpreting purpose, exercising judgment, and maintaining alignment under pressure. As introduced in the previous chapter, Craft, Crew, and Cohesion form the architectural triad of this composition. On a cruise ship or an airship, for instance, the vessel, its embedded digital systems, and its crew operate as one: the craft sustains environment and motion, the digital systems sense and regulate, and the crew navigates, decides, and acts. The same principle defines every viable unit in an enterprise—physical and digital crafts supporting a crew that enacts purpose through structure and coordination.