## Six Sigma Series: Wrapping our DMAIC up

Below is a model that I’ve put together to summarize the various pieces of each stage. I’ve intentionally not linked to any of the improvement and control elements. The improvement…

## 6 Sigma Series: calculating the correlation coefficient

Finding the relationship between input variables and the output from the process can be vital to implementing a successful Six Sigma strategy.  In the below chart, we can say that…

## 6 Sigma Series: Making Decisions; Confidence Scores

Decision making from analysis in Six Sigma is the most important part of any project. It’s great that you’ve collected lots of tasty data but if you don’t take the…

## 6 Sigma Series: finding the important X’s and sampling data

Our next task is to reduce all the inputs that we’ve identified to just those few that impact variability the most. We can start to strip down the list of…

## 6 Sigma Series: Capability index & quantifying the capability of the process to meet specification

In Six Sigma, we use capability indices to directly compare the voice of the process to the voice of the customer. This helps us to quantify the capability of the…

## 6 Sigma Series: Calculating yield, defects and the Z score

Capability is the term used to define how well a process matches the voice of the customer. To find this out, we need to be able to calculate the defect…

## 6 Sigma Series: Analyzing to deliver maximum value with Six Sigma

To truly deliver value, we first need to understand what value is from our customers’ perspective. We call this definition of value the Voice Of the Customer (VOC) and we…

## 6 Sigma Series: Getting statistical with 6 Sigma: standard deviation and short term variance

Six Sigma deploys a number of statistical methods to understand current processes. As we have discussed previously, variation in output costs the business, both directly and indirectly so we need…

## 6 Sigma Series: Diagramming for definition in Six Sigma

To identify all the X’s (inputs) in our process that impact the Y’s (the critical output(s)) through brainstorming alone can be an impossible task. So, we try to add some…

## 6 Sigma Series: Using process mapping and value streams to identify problems

Identifying problems in Six Sigma starts with a very AS-IS detailed process map (as discussed here). For each step in our process maps, we should be adding: Operation time +…