This is an exercise designed to illustrate application of several of the basic problem-solving tools of the ACE (Achieving Competitive Excellence) quality improvement system used at United Technologies Corporation. Based on a project conducted at the Nogales, Mexico, plant of Otis Elevator Corporation in 1998/1999. The exercise was created for use with "ACE Implementation at United Technologies Corporation: Otis Elevator (A)" (UVA-OM-0905), but can be used alone or in conjunction with other quality improvement materials.