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The PDSA Cycle - Safety Net Institute

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Improving Our Confidence In<br />

<strong>The</strong> Test<br />

• Remove change, then reintroduce<br />

• Stagger change in multiple time series<br />

• Add a control group<br />

• Document rival explanations for improvement<br />

Wait Time and Workload<br />

Median Wait<br />

Volume Workload<br />

90<br />

80<br />

1600<br />

1400<br />

Minutes<br />

70<br />

60<br />

50<br />

40<br />

30<br />

20<br />

10<br />

1200<br />

1000<br />

800<br />

600<br />

400<br />

200<br />

# Patient Visits<br />

0<br />

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32<br />

Weeks<br />

0

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