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accuracy achieved activities amendment analysis application software audit batch processing central processing unit changes characters check digit COBOL Computer operations computer system continuous stationery control system cost data base data collection Data control data processing decision depends design report detail devices digit discs documents effective efficiency elements ensure equipment errors example facilities factors Figure flowchart hardware ICMA important information systems input installation interactive invoices Job control languages kilos language levels linked loop machine magnetic tape mainframe Mainframe computers means memory methods Minicomputers needs objectives operating system organization packages planning possible printed printers problem procedures processor produced Punched cards re-run Read Only Memory record REVISION NOTES schedule screen speed standards storage structure SUMMARY AND REVISION supplier systems design systems specification terminal transaction transfer updated usually