Before this changeover, all records were handwritten by the employees. Often, illegible handwriting or no or incorrect recording of article numbers caused a non-negligible reduction in efficiency when creating invoices. These incorrect records meant that the employee had to be reached first and asked for the missing data. In addition to work confirmations, material slips and delivery bills, hourly records and weekly reports were also recorded exclusively by hand. These separate records meant that differences could arise between these sheets and therefore also in subsequent steps.