In continuing with my reading of the book ๐๐ข๐ ๐ก๐ญ ๐๐ญ๐๐ฉ๐ฌ ๐ญ๐จ ๐๐ซ๐จ๐๐ฅ๐๐ฆ ๐๐จ๐ฅ๐ฏ๐ข๐ง๐ ๐๐ข๐ฑ ๐๐ข๐ ๐ฆ๐ - ๐๐ซ๐ข๐ฏ๐ ๐ข๐ฆ๐ฉ๐ซ๐จ๐ฏ๐๐ฆ๐๐ง๐ญ ๐ข๐ง ๐ฒ๐จ๐ฎ๐ซ ๐จ๐ซ๐ ๐๐ง๐ข๐ณ๐๐ญ๐ข๐จ๐ง, this month I read the Chapter โ๐๐๐๐ฌ๐ฎ๐ซ๐ ๐ญ๐ก๐ ๐๐ฑ๐ญ๐๐ง๐ญ ๐๐ ๐๐ซ๐จ๐๐ฅ๐๐ฆโ and practiced the lessons it taught.
๐ฐ ๐๐๐๐๐ ๐๐๐ ๐๐๐๐๐๐๐๐๐ ๐๐๐๐๐๐๐๐ ๐๐๐๐ ๐๐๐๐๐๐๐๐ ๐๐ ๐๐๐๐ ๐๐๐๐๐๐๐:
a) Obtaining the right, accurate, and correct data is essential for any Six Sigma project. In case of mistakes in the data collection process, this can impact the overall project improvement.
b) An explanation of the difference in headings that should be used when doing root cause analysis by utilizing a Fishbone Diagram (also known as a Cause & Effect Diagram, or the Ishikawa Diagram).
For manufacturing, take note of the following: Methods, Machines (Equipment), People (Manpower), Materials, Measurements, and Environment.
People, Processes, Procedures, Place, and Environment could be the considerations for service companies.
c) In order to collect data, there must first be a Data Collection Plan and then a Data Collection Template. The part about detailing down to the minute was interesting to me. Taking this approach, the Analyze Phase and the remaining improvements would be highly effective.
๐ด๐ ๐๐๐๐๐๐๐๐๐ ๐๐๐๐๐ ๐๐๐๐ ๐๐๐ ๐๐๐ ๐๐๐๐๐๐๐ ๐๐๐ ๐๐ ๐๐๐๐๐๐๐:
i) For creating a data collection plan, 4W1H can be used.
- Four W: what, when, where, who
- One H: how
ii) Gage R&R is a tool to identify variations in measurement system performance, where R&R refers to repeatability and reproducibility.
Every process is subject to two types of variation: Variations in the measurement system and variations in the process.
Generally, LSS projects are done to reduce variation in processes, however, there may be measurement system variations that are higher than the permissible limit or unknown, and that could have a detrimental effect on a project's success if unchecked.
Attribute Gage checks for
- Repeatability within the individuals
- Reproducibility between the individuals
- Accuracy that all the results are matching the standard
R&R on Attribute Gage should include at least two resources and two trials.
You can use Excel or Minitab to perform Attribute Gage R&R.
In order to pass Gage, the percentage of appraisals against the standard must be greater than 90%.
In case it fails, find out where the problems lie and then make improvements.
If Gage passes after improvements, only then should you proceed to data collection.