A comparison of the calculated performance factors with optimum and typical failure mode performance factors identifies performance problems in {TAIL ~ the system} under {HEAD ~ test} 
A comparison of the calculated performance factors with optimum and typical failure mode performance factors identifies performance problems in { TAIL ~ the system } under { HEAD ~ test }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD