traceabletrackingtrade offtrainingtransactiontransaction based costingtransaction processing systemtransfer standardtransmission motiontravel elementtreatmenttrendtriple constrainttriztrucktrue valuetrunk lidturn back analysisturnovertwo bintwo tailed testtype i errortype ii errorunbiasunder body sealundertakingundistributed budgetunified modeling languageuniformuniformityunit loadunit under testunity of doctrineuniversaluniversityunrestrictedupdateupfrontupper specification limitupper tailed testuptimevalidationvaluevalue addedvalue chainvalue engineeringvalue indexvalue streamvariancevariance at completion