Due to its ability to closely coordinate efforts across all disciplines, requirements management has emerged as a primary driver for quality improvement across product development. This has led to the creation of several requirement management tools. IBM Rational DOORS - previously Telelogic DOORS - represents the best known solution. This analyst report discusses the challenges in implementing DOORS in a rapidly evolving environment and the clear payoffs from using DOORS to integrate across diverse disciplines and to boost the collaborative effort. Three leading users of the software in very different businesses lend their experience to this report - Sharon Crosby from the Astrium division of EADS, Susan Hacker from the Clinical and Medical Products Group of Cardinal Health, and Ed Griffor of Chrysler. Ron Zorn, a member of the IBM Telelogic Leadership Council and the Executive Advisory board, also contributed significantly to the discussion.