▁" ver ifying ▁that ▁the ▁system ▁meets ▁its ▁requirements , ▁and ▁valid ating ▁that ▁the ▁system ▁performs ▁in ▁accord ance ▁with ▁the ▁customer ▁or ▁user ▁expect ations ." ▁ ▁In ▁technology ▁product ▁development , ▁the ▁beginning ▁of ▁system ▁integration ▁testing ▁is ▁often ▁the ▁first ▁time ▁that ▁an ▁entire ▁system ▁has ▁been ▁assemble d ▁such ▁that ▁it ▁can ▁be ▁tested ▁as ▁a ▁whole . ▁ ▁In ▁order ▁to ▁make ▁system ▁testing ▁most ▁product ive , ▁the ▁many ▁constitu ent ▁assemb lies ▁and ▁sub system s ▁will ▁have ▁typically ▁gone ▁through ▁a ▁sub system ▁test ▁and ▁successfully ▁verified ▁that ▁each ▁sub system ▁meets ▁its ▁requirements ▁at ▁the ▁sub system ▁interface ▁level . ▁▁ ▁In ▁the ▁context ▁of ▁software ▁systems ▁and ▁software ▁engineering , ▁system ▁integration ▁testing ▁is ▁a ▁testing ▁process ▁that ▁exer cis es ▁a ▁software ▁system ' s ▁co ex istence ▁with ▁others . ▁With ▁multiple ▁integrated ▁systems , ▁assuming ▁that ▁each ▁have ▁already ▁passed ▁system ▁testing , ▁S IT ▁proceed s ▁to ▁test ▁their ▁required ▁interactions . ▁Following ▁this , ▁the ▁deliver ables ▁are ▁passed ▁on ▁to ▁accept ance ▁testing . ▁ ▁Software ▁system ▁integration ▁testing ▁ ▁For ▁software ▁S IT ▁is ▁part ▁of ▁the ▁software ▁testing ▁life ▁cycle ▁for ▁collabor ative ▁projects . ▁Usually , ▁a ▁round ▁of ▁S IT ▁preced es ▁the ▁user ▁accept ance ▁test ▁( U AT ) ▁round . ▁Software ▁prov iders ▁usually ▁run ▁a ▁pre - S IT ▁round ▁of ▁tests ▁before ▁consum ers ▁run ▁their ▁S IT ▁test ▁cases . ▁ ▁For ▁example , ▁if ▁an