Page 176 - Lean six sigma demystified
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Chapter 5 Redu C ing d efe C t S with Six Sigm a 155
Materials Process/methods
Why? To copy all
Dust not smoke
fishbone "objects"
Microwave popcorn Why? use Cntl-Shift-A
Printer dust Why?
Why? Problem statement
During 1990, faulty
detectors accounted for
64% of false fire alarms
Cell phones which was 7X higher
Why? than expected and
Why? Radio frequency interference caused lost productivity
and delay.
Why? Detectors below UL code
Why?
Broken water pipe
People Machines
Ishikawa fishbone Diagram
cause effect analysis
FIGURE 5-3 • Ishikawa fishbone diagram of root causes of false fire alarms.
FIGURE 5-4 • False fire alarm countermeasures.
As you can see from our graphs of the following year (Figs. 5-5 and 5-6), we
did eliminate the root cause of our problem (cell phones). We solved the prob-
lem and also initiated national standards efforts around cell phones and fire
detection equipment. When we presented this information to our local fire
department, they expressed their thanks for gaining an insight into the sharp
increase in false fire alarms they’d experienced over the last year.
