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