applying process behavior chart to the sustainability data
TRANSCRIPT
How can you tell what your sustainability data
meansApplying Quality Management tool(s) to sustainability
By Sue Ide ( [email protected])Oct 20th 2016
Food Waste : monthly food scrap collection
What do you see in this Data?
Month Year
Pounds of Food Scraps
Pound per Calendar Day
Pounds per Working Day
Days per Month
Working Days
Sep 2014 248 8.27 11.27 30 22Oct 2014 318 10.26 13.83 31 23Nov 2014 200 6.67 11.11 30 18Dec 2014 201 6.48 11.17 31 18Jan 2016 253 8.16 12.05 31 21Feb 2015 302 10.79 15.10 28 20Mar 2015 378 11.94 16.82 31 22Apr 2015 240 8.00 10.91 30 22May 2015 254 8.19 12.10 31 21Jun 2015 310 10.33 14.09 30 22Jul 2015 295 9.52 14.05 31 21Aug 2015 200 6.45 9.52 31 21Sep 2015 197 6.57 8.95 30 22Oct 2015 192 6.19 8.73 31 22Nov 2015 122 4.07 6.78 30 18Dec 2015 227 7.32 12.61 31 18Jan 2016 232 7.48 11.60 31 20Feb 2016 227 7.83 10.81 29 21Mar 2016 316 10.19 13.74 31 23Apr 2016 299 9.97 14.24 30 21May 2016 308 9.94 14.00 31 22Jun 2016 309 10.30 14.05 30 22Average 255.8 8.4 12.2 30.4 20.9
Food Waste : in a regular line chart
monthly food scrap collection data at company E
Now What do you see in this chart? Better?
Average 255.8
Food Waste : in a Process Behavior ChartThe process behavior chart begins with the data plotted in a time series.
A center line (Mean) is added as the visual reference for detecting shifts or trends
Upper and Lower control limits are computed from the data and placed symmetrically on either side of the central line
Voice of business is your target
Food Waste : Now what do you see?
✓ We identified one Exception data point. ✓ Let’s remove it. It’s not a part of the process
limits set from 01-Jul-07 to 17-Sep-07
What happened on
Nov 2015?
Oh, we outsourced
some Thanksgiving meals that
month
Food Waste :Recalculate limits. Now what do you see?
✓ We identified another Exceptional data point. ✓ Keep investigating till we confirm that the process is
limits set from 01-Jul-07 to 17-Sep-07
What happened on
Mar 2015?
Two types of variations
1.Some variation is routine ( common ), run-of-the mill, and to be expected even when the process has not changed.
2.Other variation is exceptional ( special), outside the bound of routine, and therefore to be interpreted as a signal of a process change.
Dr. Shewhart created the control chart ( Process behavior chart) to separate variation into these two components
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Point above the natural process limit Point below the natural process limit
Run above the average (8 or more consecutive points) Run below the average (8 or more consecutive points)
Trend up (6 or more consecutive increases) Trend down (6 or more consecutive decreases)
Examples of exceptional variation
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How do you use the data to improve your process?
The Process Behavior chart tells us what the current system is capable of. It is represented by the natural process limits on a Process Behavior chart. It is the extent of normal variation within the process itself.
Specifications are the company’s goal. They define what the business expects or requires. The goals they have signed up for, such as 10% energy reduction, 5% carbon emission reduction, or 25% water consumption reduction.
Chasing normal variation of data will not lead to improvement of the process--it only leads to wasted effort and confusion. In fact, in many cases, it actually leads to a degradation of the system over time.
Let’s use Quality Management tools to improve your process!
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Data will tell you if your process is improved
Process in IMPROVED!
★ LEAN is a proven Quality Management methodology by addressing common wastes in the process.
★ LEAN scrap, fewer defects, less spoilage = reduced environmental waste.
