Project Management Operational Problem Solving Implementation & Change Management Strategy & Alignment

Frank Patrick's Focused Performance Business Blog
This Focused Performance Weblog started life as a "business management blog" containing links and commentary related primarily to organizational effectiveness with a "Theory of Constraints" perspective, but is in the process of evolving towards primary content on interactive and mobile marketing. Think of it as about Focusing marketing messages for enhanced Performance. If you are on an archive page, current postings are found here.

Wednesday, October 23, 2002

Using Drum-Buffer-Rope Scheduling Rather Than Just-In-Time Production - A comparison of JIT (Lean) production and TOC-driven DBR scheduling by Patricia Huff in the Management Accounting Quarterly highlights benefits of the latter approach to production management. In it, Huff points to...
"...several studies that compare the performance of JIT and DBR. D.W. Fogarty, J.H. Blackstone, and T. R. Hoffman found that TOC processing, using DBR scheduling, "gives superior performance with less effort." DBR produced approximately 2% more units of output than the JIT production.

"In a simulation study by Cook, DBR and JIT performed better than traditional processing. However, DBR outperformed JIT in a number of categories. DBR required less inventory, which led to reduced manufacturing costs, better responsiveness to customer requirements, and the opportunity for better product quality. DBR also produced more product with a lower standard deviation of flow time. Cook defined this benefit as better due-date performance. Such performance resulted because it was easier to determine when the product would be ready for shipment."

"Based on the information presented, it appears that DBR scheduling can achieve a higher level of performance. Because it doesn't require a balanced set of production tasks, DBR lends itself to a larger number of processing situations. As in the case of a job order shop, DBR can be used in situations that allow for different sizes of batches to be processed. The evidence also indicates that DBR scheduling results in lower WIP inventories, which leads to lower investment in manufacturing costs. Compared to JIT, Drum-Buffer-Rope scheduling is clearly the superior production method."
The simplicity of DBR's reliance on letting processes work to their natural pacing while controlling WIP (and at the same time minimizing production lead time) through the release of material to the shop floor should be evident. It avoids the complexity of managing Kanbans as well as the difficulties of dealing with the potential brittleness of balanced production systems associated with JIT and its Lean progeny. It also, in implementation, provides pinpointed targets for improvements through it's execution control mechanism, Buffer Management. The "efficiency" of targeted improvement efforts cand result in fast and deep bottom line impacts. Production performance is not so much about driving out waste as it is maximizing speed, reliability and throughput.

I'm going to be facilitating a DBR implementation in a small machine shop in a few weeks. If I get the permission of the client, I'll blog a journal of the experience here. Watch this space.

posted by Frank - Permanent Link - |

Current Posts (Main Blog Page)

Previous Posts

It is a common delusion that you make things better by talking about them. - Dame Rose Macaulay



What's this XML thingie all about?


View Frank Patrick's LinkedIn profileView Frank Patrick's profile



Google
Web focusedperformance.com


FP's Recommended Reading
- From the FP Bookshelf...

...from My AStore

...and some ideas from Amazon...


Best of the FP Blog Archive
- The really good stuff...

Strategic Thinking and Improvement

Enterprise PM - It Starts with Strategic Interdependence

Face Reality

How to Think With Your Gut

Hugger-Mugger and Helter-Skelter

Managing for Murphy, Satan, and Yourself

More of the Same (Local/Global)

PMI Congress Notes: Using Risk Management for Strategic Advantage

Tell Me How You'll Measure Me and Ah, But What to Measure?

What's in Your Strategy?

Why Can't We All Just Get Along?

Why TOC Works
Project and Multi-Project Management
Critical Chain and (not or) XP

Defining Project Success (But for Whom?)

Down 'n Dirty w/TOC and PM (Part 1 of 5 consecutive posts)

End of Project Review

If Project Management is the Answer, What's the Question?

In Defense of Planning

It Ain't the Tools

Lessons Learned, Revisited

Predicting Uncertain Futures

Project Conflicts

Project Determinism (and other myths)

Project Portfolio Management

Promises, Predictions, and Planning

Removing Bottlenecks - A Core Systems Design Principle

Stage Gates and Critical Chain

Ten Top Sources of Project Failure (The Executive Version)

The Meaning of "Schedule"
Leadership and Change Management
Consistent Leadership Behavior

Invisible Dogma - Perpetuating Paradigms

Nothing But Value

On Assumption Busting

Personal Productivity - An Excuse?

The Psychology of Change Management

FP's Blogroll
- Other weblogs and sites I read


FP's Ryze Page


FP's Technorati Profile
- Click the pic



Who links to FP?


For Your Charitable Consideration:

Give Something Back Foundation

Global Virtual Classroom


FP's Link List
- Selected Sites and Resources

Critical Chain Discussion Group

Lilly Software: Visual DBR

Sciforma PS (Critical Chain Software)

Spherical Angle (Critical Chain Software)

Synchrono Supply Chain Planning Software


FP Blog Archives
- All the oldies, but goodies...

Current
10/09 | 09/09 | 08/09 | 07/09 | 06/09 | 05/09 | 04/09 | 03/09 | 02/09 | 01/09 | 12/08 | 11/08 | 10/08 | 09/08 | 08/08 | 07/08 | 06/08 | 05/08 | 04/08 | 03/08 | 02/08 | 01/08 | 12/07 | 11/07 | 10/07 | 09/07 | 08/07 | 07/07 | 06/07 | 05/07 | 04/07 | 03/07 | 02/07 | 01/07 | 12/06 | 11/06 | 10/06 | 09/06 | 08/06 | 07/06 | 06/06 | 05/06 | 04/06 | 03/06 | 02/06 | 01/06 | 12/05 | 11/05 | 10/05 | 09/05 | 08/05 | 07/05 | 06/05 | 05/05 | 04/05 | 03/05 | 02/05 | 01/05 | 12/04 | 11/04 | 10/04 | 09/04 | 08/04 | 07/04 | 06/04 | 05/04 | 04/04 | 03/04 | 02/04 | 01/04 | 12/03 | 11/03 | 10/03 | 09/03 | 08/03 | 07/03 | 06/03 | 05/03 | 04/03 | 03/03 | 02/03 | 01/03 | 12/02 | 11/02 | 10/02 | 09/02 | 08/02 | 07/02 | 06/02 | 03/02 | 02/02 | 12/01 | 11/01 | 10/01 | 09/01 | 08/01 | 06/01 | 02/01 | 01/01 | 12/00


Powered by Blogger

If you are interested in adding an easily updated weblog to your site, I would suggest you look into the free service provided by Blogger.

Who is FP?
Contact Focused Performance