vltnry dtbs dsgn nvlvs ncrmntl mprvmnts t th dtbs schm s tht t cn b cntnsly pdtd wth chngs, rflctng th cstmr's rqrmnts. Ppl crss th glb wrk n th sm pc f sftwr t th sm tm hnc, thr s nd fr tchnqs tht llw smth vltn f dtbs s th dsgn dvlps. Sch mthds tlz tmtd rfctrng nd cntns ntgrtn s tht t spprts gl mthdlgs fr sftwr dvlpmnt. Ths dvlpmnt tchnqs r ppld n systms tht r n pr-prdctn stg s wll n systms tht hv lrdy bn rlsd. Ths tchnqs nt nly cvr rlvnt chngs n th dtbs schm ccrdng t cstmr's chngng nds, bt ls mgrtn f mdfd dt nt th dtbs nd ls cstmzng th dtbs ccss cd ccrdngly wtht chngng th dt smntcs.