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Data input required intermediate processing via punched paper tape or [[punch card|card]] and separate input to computers, usually for overnight processing. Data required validation in batches. All of this was a repetitive, labour intensive task, removed from user control and error-prone. Invalid or incorrect data needed correction and resubmission with consequences for data and account reconciliation.
Data storage was strictly serial on paper tape, and then later to [[magnetic tape]]: the use of data storage within readily accessible memory was not cost-effective.
Results would be presented to users on paper. Enquiries were delayed by whatever turn round was available.
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