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What are the pros and cons of both lean and six sigma?
What are the pros and cons of both lean and six sigma?
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There are not pros and cons. Just to put this in the context of PMI, the key role to work with implementing approaches into an organization is the business analyst (BA). The first thing to do is an activity called "Needs Assessment" where the BA takes the current situation and the future desire situation to achieve and based on enteprise architecture helps to define the solution. In this case, the solution could be to implement lean, six sigma or both. All this based on the organizations are open and adaptable systems. Then, pros and cons must be analized in the context of using it as solutions to business problems.
Sarmad -

The advantage is that both take a customer-centric approach to improving the value delivered.

There are really no disadvantages with lean - the issues are with how leadership teams have chosen to adopt it. If they just "do" lean without fundamentally changing their philosophy about quality and continuous improvement, they won't reap the benefits.

Six Sigma is very helpful when you have processes which are expected to be in control and where there is a decent amount of data to enable the use of its tools. When processes are out of control or there is high variation or when you have extremely limited data, it is less useful.

The drawbacks are not intrinsic to lean or six sigma. A new approach will cost you time and money to implement. Part of the cost is the revenue/profit loss of not doing something else with that time and money. (Any new approach will create a negative cash flow until it has been integrated into the company culture.)

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