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