Previously (and still too frequently), a sheet of paper is carried around a store or stockroom and the item numbers or description of each item, together with the quantity in stock, is written down. This information is then keyed into a computer later. This process is slow and allows for errors at the point when the number is written down, and again when it is keyed in at the computer.
If all products are barcoded, then with a PDC terminal each item can be simply and accurately scanned, a quantity entered if required, and the data quickly downloaded to a computer for automatic entry into a database or spreadsheet, printing or e-mailing.
A PDC terminal can also be loaded with data before a stocktake, such as a list of the items on the main stock file and their details, therefore giving the user instant feedback on discrepancies in quantities, price checks etc.