In the late 1970s, the computer industry was dominated by huge, vertically integrated companies like IBM, Burroughs, and Digital Equipment. With their vast scale advantages and huge installed bases, they seemed unassailable. Yet just ten years later, the power in the industry had shifted. The behemoths were struggling to survive while an army of smaller, highly specialized companies was thriving. What happened? The industry’s sea change can be traced back to 1978, when a then-tiny company, Apple Computer, launched the Apple II personal computer. The Apple II’s open architecture unlocked the computer business, allowing the entry of many new companies that specialized in producing specific hardware and software components. Immediately, the advantages of the generalist—size, reputation, integration—began to wither. The new advantages—creativity, speed, flexibility—belonged to the specialist.