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OPS/574 v1
Statistical Process Control Methods
Process Evaluation
Evaluate your process using 1 of the following:
•
•
Use the lean concept to find ways to eliminate waste and improve the process
SPC or Six Sigma to reduce defects or variances in the process
The process improvement for XYZ medical center evaluation employs the SPC to assess if the
improved process is controlled. Notably, the strategy focused on reducing the turnaround time from the
current average of 2 hrs to an average of 15 mins. The improved process included a new pharmacy
cashier to avoid patients paying for their consultation and medication crowding at the same pharmacy.
The new approach would reduce the time taken by patients leading to improved satisfaction that has
been on the decline as the hospital population grows. Statistical process control is an approach that
employs statistical techniques to help in monitoring and controlling a process, thereby ensuring
process efficiency.
Evaluation of Control Chart and Process Metrics
Complete the following in Excel:
•
•
Calculate the defined process metrics including variation and process capability.
Develop and display a control chart for the process.
Evaluate the control chart and process metrics using Statistical Process Control (SPC) methods.
Determine whether the process could benefit from the use of Six Sigma, Lean, or other tools. (Include all
calculation and charts.)
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Statistical Process Control Methods
OPS/574 v1
Page 2 of 4
Process Capability
The table below illustrates the determining process capability with lower and upper specification limits =
5 and 60 minutes, respectively.
Process Capability
Upper Specification Limit
Lower Specification Limit
Standard deviation
Process Capability= (USL-LSL)/6ơ
60
5
3.45
Process capability index
2.65
Based on the calculation above using six deviations, the process capability index for the process is
2.65.
Control Chart
Control Chart for Turnaround Time
Turnaround Time (in Minutes)
30
UCL(3ơ)
25
20
15
Mean
10
5
LCL(3ơ)
0
1
2
3
4
5...