How To Understand Trendiness in Supply Chain Management

Executive Summary

  • George Plossl’s View on the trendiness of supply chain management.
  • The difficult spot that consultants often put companies as they move from one trend to the next.


With terms like JIT, TQM, Lean, B2B marketplaces, Kanban, optimization, supply chain management is filled with trendy concepts that influence decision makers (a strangely high percentage of which are Japanese in origin for some reason).

In fact, for an area of study that is supposed to be more of a science than an art, supply chain management has been remarkably trendy.

I have previously described the fact that approaches applied to supply chain software very frequently do not have to pass any logical test. As I stated in response to a comment on demand sensing being a method to primarily fake forecast accuracy:

“One consultant I was working with stated that company XYZ was reported to have success with the approach. I had just come from that exact company, and my experience with them was they neither their executives nor their IT group knew anything about forecasting, and this multi-billion dollar company could not do the most elementary forecasting functions. Actually, very few companies can be used as models for forecasting excellence. Most companies do a horrible job of taking advantage of systems to improve their forecast.

However, if a big consulting company does something, or a big client does something, that seems to be sufficient evidence that other people should do it as well. I think the first question needs to be “does it make sense?” and secondly, “have we tested it?” The fact that a consulting company or a client did this or that really means nothing. Very few executives call in journalists into their office to report that they completely bombed on their IT implementation because they were ripped off by Accenture who lied to them about what software could do for them and this caused them to miss their quarter. This is called reporting bias, and obviously must be adjusted for.”

Illogical Supply Chain Management Trends

Observing the illogical nature of many supply chain management trends was noticed and written about decades ago by George Plossl. George Plossl was very focused on practical and often mathematical approaches managing the supply chain, and therefore many of the trends in a supply chain, most of which have failed to pay dividends must have struck him is strange as they strike me.

“Probably the greatest misconception is that the job of effective planning and control is primarily technical. The literature of the technical societies and the words of a few consultants have led many managers to believe that all they need for control are the right techniques in a system. Overselling sound and necessary techniques like MRP has certainly been a great disservice to hard-pressed managers. Interest in new techniques flares up like fads in clothing and sports. Too many managers seem to believe that they can buy their way out of trouble quickly by adopting the Japanese “Kanban” technique or the Israeli super mathematical “Optimal Production Technology.” Over-simplified solutions to complex problems, like jogging for better health and fad diets, continue to beguile many people unwilling to adopt the necessary changes in life-style so needed for achieving their real goals. Sound planning, effective execution of the plan and adequate control requires more than techniques and computer programs however elegant and expensive these may be.” – George Plossl

In this quote, George Plossl does a good job of explaining the penchant for trends that he saw in his consulting work.

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“Production and Inventory Control: Applications,” George Plossl, George Plossl Education Services, 1983

To get a good basis in supply planning, see my book on supply planning software.

Supply Planning Book


Supply Planning with MRP, DRP and APS Software

Showing the Pathway for Improvement

Supply planning software, and by extension supply planning itself, could be used much more efficiently than it currently is. Why aren’t things better?

Providing an Overall Understanding of Supply Planning in Software

Unlike most books about software, this book showcases more than one vendor. Focusing an entire book on a single software application is beneficial for those that want to use the application in question solely. However, this book is designed for people that want to understand supply planning in systems.

  • What methods fall into APS?
  • How do the different methods work and how do they differ in how they generate output?
  • What is the sequence of supply planning runs?

These types of questions are answered for readers in this book.

This book explains the primary methods that are used for supply planning, the supply planning parameters that control the planning output as well as how they relate to one another.

Who is This Book For?

This book as a practical primer for anyone looking to perform a supply planning software selection, any person beginning a supply planning project, or anyone who just wants to understand supply planning software simply better.


  • Chapter 1: Introduction
  • Chapter 2: Where Supply Planning Fits Within the Supply Chain Planning Footprint
  • Chapter 3: MRP Explained
  • Chapter 4: DRP Explained
  • Chapter 5: APS Supply Planning Methods
  • Chapter 6: APS for Deployment
  • Chapter 7: Constraint-based Planning
  • Chapter 8: Reorder Point Planning
  • Chapter 9: Planning Parameters
  • Chapter 10: How MRP, DRP, and APS Relate to One Another
  • Chapter 11: Supply Planning Visibility and Master Data Management
  • Chapter 12: Understanding the Difference Between Production Versus Simulation