ocr: Three Categories ofStock One further complication arises from the fact that if you were to freeze a production line at a single momenti in time you would discover three different categories of stock: - - - - - - - - - A - RAW MATERIAL WORKIN FINISHED GOODS (unused purchases) PROGRESS (completed items (partly completed waiting to be sold) products) In exactly the same way as we have been making a purchases adjustment in our trading entities cost of sales calculations, so we must make adjustments for these three categories of stock in our manufacturing cost of sales calculation.