BC228A The Board considered the transition provisions and effective date of the amendment to paragraph 80(b). The Board noted that the assessment of goodwill impairment might involve the use of hindsight in determining the fair values of the cash‑generating units at the end of a past reporting period. Considering practicability, the Board decided that the effective date should be for annual periods beginning on or after 1 January 2010 although the Board noted that the effective date of IFRS 8 is 1 January 2009. Therefore, the Board decided that an entity should apply the amendment to paragraph 80(b) made by Improvements to IFRSs issued in April 2009 prospectively for annual periods beginning on or after 1 January 2010.