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THE COMPUTER PAST PRESENT
WHY DO WE USE COMPUTERS?
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achieve activities application software approach areas assess audit batch batch processing become benefits calculations changeover check digit client COBOL computer centre computer files computer operations computer system computer terminal computer-based systems computermen concerned cost criteria customers data base data processing dependent detailed devices direct changeover discipline disk effective efficiency ensure environment equipment errors example facilities failure files handling hardware important improved input installation invoices involved levels machine magnetic tape mainframe mainframe computers management services manual system means minicomputer multiprocessing Murphy's law necessary objectives operating system organisation output overcome packages planning possible problems procedures produce purchase ledger reasons received record reliability reports rerun resistance sales ledger schedule screen selection simply skilled speed staff step storage supplier system specification systems development systems test tasks terminals transaction processing turnkey companies usually