Investors require financial data that is comparable over time, comparable within a single set of financial statements, and comparable between companies. Unfortunately, this is not always the case. We explain how differences between IFRS and US GAAP, accounting policy options, differing interpretations and accounting estimates, can all reduce comparability. Convergence and comparability should be a priority for the IASB and FASB. Present consultations by the IASB and FASB regarding the account...