Financial ratio analysis is not without some limitations. First of all, financial ratios are
based on accounting data, and firms differ in their treatment of such items as depreciation, inventory valuation, research and development expenditures, pension plan costs, mergers, and taxes. Also, seasonal factors can influence comparative ratios. Therefore, conformity to industry composite ratios does not establish with certainty that a firm is performing normally or that it is well managed. Likewise, departures from industry averages do not always indicate that a firm is doing especially well or badly. For example, a high inventory turnover ratio could indicate efficient inventory management and a strong working capital position, but it also could indicate a serious inventory shortage and a weak working capital position.