▁or ▁series ▁of ▁documents ▁needs ▁to ▁be ▁translated ▁only ▁once ▁and ▁can ▁be ▁used ▁several ▁times . ▁ ▁For ▁large ▁documentation ▁projects , ▁sav ings ▁( in ▁time ▁or ▁money ) ▁thanks ▁to ▁the ▁use ▁of ▁a ▁T M ▁package ▁may ▁already ▁be ▁apparent ▁even ▁for ▁the ▁first ▁translation ▁of ▁a ▁new ▁project , ▁but ▁normally ▁such ▁sav ings ▁are ▁only ▁apparent ▁when ▁transl ating ▁subsequent ▁versions ▁of ▁a ▁project ▁that ▁was ▁translated ▁before ▁using ▁translation ▁memory . ▁ ▁Main ▁obst acles ▁▁ ▁The ▁main ▁problems ▁h ind ering ▁wider ▁use ▁of ▁translation ▁memory ▁man agers ▁include : ▁▁ ▁The ▁concept ▁of ▁" trans lation ▁mem ories " ▁is ▁based ▁on ▁the ▁prem ise ▁that ▁sentences ▁used ▁in ▁previous ▁transl ations ▁can ▁be ▁" re cyc led ". ▁However , ▁a ▁gu iding ▁principle ▁of ▁translation ▁is ▁that ▁the ▁transl ator ▁must ▁translate ▁the ▁message ▁of ▁the ▁text , ▁and ▁not ▁its ▁component ▁sentences . ▁ ▁Trans lation ▁memory ▁man agers ▁do ▁not ▁easily ▁fit ▁into ▁existing ▁translation ▁or ▁local ization ▁processes . ▁In ▁order ▁to ▁take ▁advantage ▁of ▁T M ▁technology , ▁the ▁translation ▁processes ▁must ▁be ▁red es igned . ▁ ▁Trans lation ▁memory ▁man agers ▁do ▁not ▁presently ▁support ▁all ▁documentation ▁formats , ▁and ▁filters ▁may ▁not ▁exist ▁to ▁support ▁all ▁file ▁types . ▁ ▁There ▁is ▁a ▁learning ▁curve ▁associated ▁with ▁using ▁translation ▁memory ▁man agers , ▁and ▁the ▁programs ▁must ▁be ▁custom ized ▁for ▁greatest ▁effect iveness . ▁ ▁In ▁cases ▁where ▁all ▁or ▁part ▁of ▁the ▁translation