This is the inside story of the development of Windows NT. NT took five years and $150 million to complete. For much of that time, the massive program demanded the attention of more than 200 testers, writers and technicians. This book tells the tale and lays bare the messy, wrenching reality of large scale software innovation. Revealed are the pressures, disappointments, and ultimate triumph that emerge from a cauldron of constant deadlines, competition with peers, and a perpetual war against ubiquitous bugs.