Layers of system architecture, 122

Legacy elements, 214–215

Level 1 architecture, 162–165

• clustering, 173–175

• concept expanded to architecture, 162–163

• development of, 162–165

• form defined for, 163–164

• mapping function to form, 164–165

• modularizing the system, 173–175

• zigzagging, 163–164

Level 2 architecture, 166–170

• development of, 166–170

• home data network architecture at, 170–173

• intent and, 166

• processes and relationships, 167–168

• recursion for, 166–167

• zooming to, 167

Liability, regulation and, 206

Logical relationships, 43–44