- A&E Products Group LP
- ABN Amro Mortgage
- ABN AMRO Mortgage Group
- ACNielsen
- Acuity Brands Lighting
- Advanced Fibre Communications
- AdvancePCS
- AGResearch International
- Alliance Data Systems
- Alliant Energy
- Allstate Financial
- Alorica
- Amazon.com
- Amemco/SafeNet
- Ametek Aerospace, Gulton-Statham Products
- Amgen
- Ansell Healthcare
- Anthem Blue Cross Blue Shield
- APAC Customer Services
- Armstrong World Industries
- Artizen, Inc.
- AstraZeneca
- Avery Dennison
- AWS Convergence Technologies
- Bank of America
- Bankers Life and Casualty
- Barbachano International, Inc.
- Bayer HealthCare Diagnostics Division
- Blue Cross and Blue Shield of FL
- Bonell Ryan Inc.
- Booz Allen Hamilton
- BP
- Burlington Northern Santa Fe Railway
- Cabot Microelectronics Corporation
- Cardinal Health
- Cendant Mortgage
- Circuit City Stores, Inc.
- Cisco Systems
- Convergys Corporation
- Cooper Cameron Corporation
- Covenant HealthCare
- Cross Country Automotive Services
- Crutchfield Corporation
- Dana Corporation
- Defense Finance and Accounting Service
- Design Systems, Inc.
- Dynacraft, a division of PACCAR
- Eaton Corporation
- eBay
- Educational Testing Service
- Essilor of America
- Expedia Inc.
- Experian
- Express Scripts
- ExpressBill/WebMD
- Exult
- Fannie Mae
- Federated Logistics & Operations
- Fidelity Investments
- Foley Incorporated
- Genentech, Inc
- General Fiber Communications, Inc.
- GTSI
- Haemonetics Corporation
- Health Alliance
- Hoffmann La-Roche
- Household Credit Card Services
- Household Mortgage Services
- Humana Inc.
- IDX Systems Corporation
- Ingersoll-Rand
- Ingersoll-Rand (Thermo King)
- Ingram Micro
- Ingram Micro Canada
- Intermatic Inc.
- Intuit
- Johnson & Johnson
- Juran Institute
- Kenco Group, Inc.
- Kennecott Utah Copper
- KM Logistics
- Kyphon Inc.
- LifeScan, Inc.
- Lithonia Lighting
- Masterfoods USA
- McKesson Corporation
- Medical Concepts Development, Inc.
- Medtronic
- Metaldyne
- Microsoft
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- Mirifex Systems LLC
- Motorola
- MSC Industrial Direct Co., Inc.
- NCC Biomed
- NCR Corporation
- Nestle Waters
- Nuclear Fuel Services, Inc.
- Oce North America, Inc.
- Olean General Hospital
- OMC Ltd
- Outpatient Imaging Affiliates
- Owens Corning
- Panduit Corp.
- Parker Chomerics
- Parker Hannifin
- Pella Corporation
- Penna Consulting Plc
- Pershing
- Philips Lighting
- Philips Medical Systems
- Pitney Bowes
- Pivotal Resources
- PNM
- Powerware
- Praxair
- PricewaterhouseCoopers LLP
- Providence Health System
- Quest Diagnostics
- Rath & Strong
- Raytheon Space and Airborne Systems
- Rockwell Collins
- Sun Microsystems
- Ricoh
- Rubbermaid
- Saint Agnes Medical Center
- Samsung Electronics America
- Scientific-Atlanta
- Seagate
- Sears, Roebuck and Co.
- Selectis Corporation
- Shaw Industries, Inc.
- Sheraton
- Sherwin-Williams
- Sigma Process Solutions
- SIRVA, Inc.
- Six Sigma Applications
- Six Sigma Brokers
- Six Sigma Qualtec
- Smarter Solutions, Inc.
- Sonoco
- Standard Insurance Company
- Standard Register Company
- Starwood Hotels & Resorts Worldwide, Inc.
- Sun Microsystems
- Suntron Corp
- Systems Methodologies, Inc.
- Telex Communications
- Temple University Hospital
- Texas Children's Hospital
- The Hartford
- The Hartford Financial Services Group
- The Home Depot
- The Vanguard Group
- Trojan Battery Company
- TSYS
- TVC
- Tyco Fire & Building Products
- Tyco International
- Tyco Plastics & Adhesives, A&E Products Group
- Tyco Valves and Controls
- Tyler & Company
- UBS Investment Bank
- UCLA External Affairs
- Union Pacific Railroad
- United Health Group
- UnitedHealth Group - Ovations
- USAA
- ValueArchitects
- Vistakon
- VSE Corporation
- Washington Mutual Bank
- Wellmark Blue Cross Blue Shield
- Wells Fargo - Consumer Credit Group
- Western Digital
- Western Management Consultants
- Western Maryland Health System
- Wyeth Pharmaceuticals
- Xcel Energy
- Xchanging Ins-sure Services
- Xerox Corporation
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