Control Charts: are used for determining stability of a process. Important
terms are:
USL - Upper Specification Limit
LSL - Lower Specification Limit
UCL - Upper Control Limit
LCL - Lower Control Limit
First two are set by customer and last two are normally (+-) 3 Sigma.
Normally used to track repititive activities, sometimes they are also used
to monitor
cost and schedule variances, volume and frequency of scope changes.
A process is out of control when seven consecutive data points are above or
below the mean.
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