Methodology is presented for the design of single and double compresse
d-limit sequential probability ratio tests (SPRT) and cumulative sum (
CUSUM) control charts to detect one-sided mean shifts in a symmetric p
robability distribution. We also show how to evaluate the average run
length properties with the fast initial response (FIR) feature. The re
sulting CUSUM plans have a simple scoring procedure, and are extremely
simple to derive and implement. The use of two compressed-limit gauge
s is more efficient than a single compressed-limit gauge. In the case
of SPRTs, the use of two compressed limit gauges minimizes the average
sampling number required for specified operating characteristics. In
the case of CUSUM, the gain in efficiency reduces the out-of-control a
verage run length for a given in-control average run length.