This is a Japanese translation of the June 16, 2003 version of UVA-BP-0472. This case presents the "best practices" of a highly successful post-merger integrator that grew from $400 million in 1997, to $1.5 billion in 2000, to $4 billion in 2002.The case focus is on the $4.0 billion IT sector of Northrop Grumman, a company confronting immense change in the rapidly consolidating defense business. This integration is unique in that the product is a complete melding of various companies, systems, leaderships, and cultures of 11 legacy organizations. Not only is the result an organization with a new identity, but also one with new strategic capabilities unavailable to any of the stand-alone legacy companies. A teaching note is available to registered faculty, along with video clips that include footage of weapons systems (e.g., B-2 bomber) and information about the company's PMI process.