Why six-sigma, just-in-time and lean manufacturing are dangerous!
Six sigma is a great idea: make sure that your product or service is as close to perfect as possible with almost zero (3.4 in a million) faults. So is just-in-time (JIT) and lean manufacturing. All involve tight control on business processes and require businesses to focus on efficiency. You can’t have a JIT manufacturing process without being highly efficient in controlling all aspects of your supply chain.
The problem is that when circumstances change it can be difficult to adapt the processes quickly enough. When the change is disruptive then it’s likely to lead to business failure. Casey Haksins and Peter Sims describe this in a Harvard Business Review blog post: The Most Efficient Die Early.
The authors correctly point out that business must also expect the unexpected and plan to absorb it and cope with it. The problem is that pursuing greater and greater efficiency goes against this need for flexibility to change. Instead there needs to be a balance. Look for efficiency but not at the cost of losing flexibility. Success requires both.