... master file. * Delete a record from the master file. * Amend / update an existing record in the master file. At some predetermined time (e.g. the end of the day or week) the computer system will process the data stored in the transaction file and make any changes that are necessary to the master file as a result of the transactions. This will produce an updated master file and an error report detailing any transactions that could not be processed for some reason. Before this processing can take place the transactions must be prepared for processing. To do these two operations must be carried out: Validating: Each transaction that is entered is validated to check that it is unlikely to halt processing by causing an error. It is very important that processing is not halted in a batch processing system because processing often takes place overnight without a human operator being ...

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