DMAIC is Six Sigma’s signature framework for process improvement. It provides a structured way of improving a process.
A DMAIC improvement process:
- Is data-driven.
- Is followed in a strict sequence.
- Uses all five steps.
The Five DMAIC Stages
The five stages we use are:
- Define: Collate what we already know about the existing process.
- Measure: Collect further data about the existing process.
- Analyze: Identify the core problems that we’ll address.
- Improve: Plan, test, and implement solutions.
- Control: Set up supports to ensure that successful solutions are sustainable.
History of DMAIC
Michel Harry & Bill Smith created “MAIC” – the methodology that evolved to become DMAIC.
Harry includes the following strategy elements in the traditional approach to Six Sigma:
- (R) Recognize the true state of your business
- (S) Standardize the systems that prove to be best-in-class
- (I) Integrate best-in-class systems into the strategic planning framework.
In the Define phase, you collate a lot of information that you already have available. You’ll:
- Understand the project, including its purpose and scope.
- Map the current process.
- Determine whether the process is a good candidate for DMAIC.
- Detail customer expectations.
- Estimate timelines and costs.
Should you use DMAIC?
Some projects aren’t suitable for this process. For example:
- It’s already very clear what the problem is, and how to solve it.
- There’s no or little available data on the process to be improved.
- Managers and leaders do not support improvements to this process.
- The process does not directly impact key performance indicators.
- Measuring process improvements would be difficult or impossible.
Further information about the Define phase
For more information about the Define phase, the steps to go through and the tools to use, see Define Phase (DMAIC).
You’ve mapped the existing process, you understand the project, and you’ve decided that this is a good DMAIC candidate. You’ve listed customer expectations and estimated the times and costs involved.
Your next phase involves a lot of measurements. You need to have baseline figures so that you can accurately assess progress in later phases.
During this phase, you will:
- Identify the data that you need to collect.
- Decide what measurements to use.
- Figure out what methods to use to collect your measurements.
- Determine the level of variation that you’ll be dealing with.
- Collect the data as per previous points.
Further information about the Measure phase
For more information about the Measure phase, the steps to go through and the tools to use, see Measure Phase (DMAIC).
In the Analyze phase, you work with the data that you collected in the Measure phase. You’ll:
- Identify defect causes.
- Analyze these to pinpoint the root cause.
Further information about the Analyze phase
For more information about the Analyze phase, the steps to go through and the tools to use, see Analyze Phase (DMAIC).
You’ve identified the root cause of your issue in the Analyze phase. Now you need to come up with a solution. You’ll:
- Pull in people who perform or oversee the process.
- Brainstorm potential solutions.
- Determine criteria for selecting a solution.
- Weigh potential solutions against the criteria.
- Pick a solution.
- Test the chosen solution.
- Measure the results and compare them to the Measure phase data.
Further information about the Improve phase
For more information about the Improve phase, the steps to go through and the tools to use, see Improve Phase (DMAIC).
Once you’re happy that the chosen solution will improve the process, it’s time to implement the Control phase. This is where you actually implement said solution, but there are some other tasks too:
- Document the solution.
- Collect data about how the solution is working in production.
- Put supports in place to ensure that the solution is permanent, not temporary.
- Set up a plan to deal with any issues that might arise.
- Plan handover to the operations personnel.
Further information about the Control phase
For more information about the Control phase, the steps to go through and the tools to use, see Control Phase (DMAIC).
DMAIC Tollgate Reviews
You’ll typically review progress regularly with your sponsors. This kind of review, especially when ending one phase and moving on to the next, is called a Tollgate review.
Learn more about DMAIC tollgate reviews here.