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access key action address Record and/or arrow assigned attribute bank basic batch block Breakdown Structure buffer C/S PCS cess claim number Cobol CODASYL communigraph contains cost data base design data integrity data redundancy defined Demand Deposit dependent dependent records descriptor desired efficiency employee entity class entry environment example exist field hierarchy identified implementation implies indexed sequential indexi indicate information elements information space inventory knotted list logical address logical records logical structure maintained mass storage device master files material item ment method number of physical operating ords organization owner performance permit person physical address physical record possible problem random record types relationship represents schedule security copy segment selective sequence sequential access sequential file set class shown in Figure skill record sort specific struc structure diagram tape task techniques time-sharing tion transactions