weekly reports are required from all service departments. They are made on large sheets labeled Income Sheets. The sheets are compiled by the department heads from the yellow invoice copies which are collected by their departments as proof of payment before delivering a service or item sold. All invoices are simply listed in numerical sequence on the IncomeSheet, with the date, name of the customer and details of service or item sold. The amount of the invoice is entered in the appropriate column, whether cash payment, debit, credit, or no-chargeinvoice. The Income Sheets are the basicelement of an internal income policing system. (BPL 1 Feb 72RA)