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About Constraints Management Group, LLC 

Constraints Management Group, LLC (CMG) is part of a family of companies dedicated to delivering Demand Driven solutions to manufacturing and supply chain companies that are facing the complex and highly volatile circumstances of today’s global economy.  CMG was co-founded by Debra Smith and Chad Smith.

Thought Leadership


                                    CMG is a global thought leader in the emerging demand driven principles that combine rigorous and robust                                           formal planning, scheduling and execution with the pull-based and visibility emphasis of methods like Lean and The Theory of Constraints.  CMG has been at the forefront of both research and practical application of this developing body of knowledge since 1995. With the recent release of Demand Driven Performance – Using Smart Metrics, CMG has again taken a leadership role in the required changes in Finance and Accounting required to support a Demand Driven Adaptive System.   

Books authored or co-authored by CMG Principals span two decades:

Orlicky's Material Requirements Planning

The Demand Driven MRP was first articulated in Orlicky’s Material Requirements Planning 3/E (Ptak and Smith, McGraw-Hill, 2011).  The history of Demand Driven Management, it’s Principles and the underlying science are fully articulated in Demand Driven Performance – Using Smart Metrics (Smith and Smith, McGraw-Hill, 2013).

Rapid, Sustainable Results for Global Leaders

Constraints Management Group, LLC has a history of delivering massive and rapid bottom line improvements in mid-range and large global companies including:

Unilever, Corona, Miba Bearings US, Wärtsilä, Oregon Freeze Dry, Avigilon, IBM Global Services, Romac, LeTourneau Technologies, Inc. (Joy Global), Stemcell, Honeyville, The Charles Machine Works (Ditch Witch), Roseburg Forest Products, Wahl Clippers, Michelin, Tube Forgings, and Siegwerk.

The Demand Driven Family of Companies







Constraints Management Group, LLC: CMG is Headquartered in the Seattle, WA, area and was founded in 1997 by Debra A. Smith and Chad Smith.  Together with their partners past and present they are responsible for the development, articulation and practical application of the Demand Driven Principles.  Constraints Management Group is a services company focused on implementing the Demand Driven concepts and applications in major corporations in a wide array of industries including aerospace, fast moving consumer goods, wood products, medical products, heavy assembly, machining and fabrication.  With thought leadership in the areas of planning, scheduling and finance and metrics CMG can guide and assist even the largest corporations in implementing Demand Driven concepts.  Collectively CMG partners have authored and co-authored published works that detail and articulate the evolution of Demand Driven Principles applied as it applies to Finance and Information systems, Planning and Inventory Management, Scheduling and Execution. 






The Demand Driven Institute (DDI) was founded in 2011 by Carol Ptak and Chad Smith.  Collectively, Ms. Ptak and Mr. Smith have authored or co-authored several published works on Demand Driven Principles, Finance and Information and Planning Systems. 







DDI has jointly developed internationally accredited professional certificates for demand driven principles.  Our educational products are the undisputed leaders in the category.  Our educational products are preparatory education for Professional certification testing and are used around the world to support Demand Driven implementations.  Well over 4,000 people have been through our education in the last six years.

In 2011 Constraints Management Group split off its software group to create Demand Driven Technologies.  Demand Driven Technologies is the premier provider of next generation materials, inventory and production control planning and scheduling and manufacturing execution applications for the new Demand Driven world. 

 The Replenishment+® application was the first fully compliant Demand Driven MRP (DDMRP) software in the world and continues to lead the way with an Advanced Planning Module, Stock Deployment Module and Analytics.  DBR+™ is the only Demand Driven Scheduling and Manufacturing Execution System in the world that is Demand Driven Scheduling and Execution compliant.  It integrates seamlessly with Replenishment +® to ensure priority signals are aligned with stock status and customer request dates.  Together they comprise a Demand Driven Operating Model capable of supplying all the information and analytics necessary for a Demand Driven S&OP process that aligns execution actions with tactics and a Company’s market strategy.  Demand Driven Technologies has a global reach through its growing Channel Partner network and joint ventures with ERP companies. 


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