Page 135 - Lean six sigma demystified

114 Lean Six Sigma DemystifieD

FIGURE 4-5 • Check sheet of support calls.

understanding Gage R&R, then we’d write “Gage R&R” in A3 and put a stroke
tally in the day of the week (e.g., Monday). Then continue adding to the check
sheet as the week goes on, adding defects, problems, or symptoms. By the end
of the week, you’ll have an interesting picture of support calls (Fig. 4-5).
Just add up the number of calls and one bucket or another will jump out as
the majority of the calls.

Hint: Use a Pareto chart (Fig. 4-6) to show most common support calls.

Support calls
20 100.0%
90.0%
18 90.0%
16 15 75.0% 80.0%
14 70.0%
Number of calls 10 8 50.0%
12
60.0%

40.0%

4 6 3 30.0%
20.0%
2
2 10.0%
0 0.0%
Excel disabled macros SPC question Gage R&R
Type of call
FIGURE 4-6 • Pareto chart of support calls.

But now the questions arise: Why is Excel disabling the macros? Request for
quotes? Deliveries?
Spending a lot of time and money setting up a measurement system to track
just these items, it wouldn’t do much good. Instead, tune up the check sheet to
provide better data (Figs. 4-7 and 4-8).