While use of historical cost measurement is criticised for its lack of timely reporting of value changes, it remains in use in most accounting systems during periods of low and high inflation and deflation. During hyperinflation, International Financial Reporting Standards (IFRS) require financial capital maintenance in units of constant purchasing power in terms of the monthly CPI as set out in IAS 29, Financial Reporting in Hyperinflationary Economies. Various adjustments to historical cost are used, many of which require the use of management judgment and may be difficult to verify. The trend in most accounting standards is towards more timely reflection of the fair or market value of some assets and liabilities, although the historical cost principle remains in use. Many accounting standards require disclosure of current values for certain assets and liabilities in the footnotes to the financial statements instead of reporting them on the balance sheet.