Posted on April 23, 2008 by admin

Two Types of Bottleneck

In some of the early Theory of Constraints literature Eli Goldratt would talk about three types of bottleneck - capacity constrained resources (CCRs), policies and market constraints. In recent, years he changed his mind and simplified the model. Policies are no longer constraints, they are merely exploitation or subordination techniques - elements 2 and 3 of his Five Focusing Steps.

Posted on April 23, 2008 by admin

Detecting Bottlenecks in a Kanban System

How do you identify a bottleneck in a kanban system? For the last 5 years, I've been teaching teams to identify bottlenecks using Cumulative Flow Diagrams (CFDs), Figure 1. A growing gap shown as a bulge in a colored section of the graph indicates growth in work-in-progress (WIP). And this illustrates where the bottleneck is to be found.

Posted on April 01, 2008 by admin

Maturing through the Recipe for Success

Pete Abilla rightly points out that while the advice I gave yesterday, that in Lean decision making, value trumps flow, and flow trumps waste elimination, this does not mean that in a Lean transition a focus on value happens first or as a priority over a focus on flow and that a focus on smooth flow happens before a focus on waste elimination.

Pete is right!