Peng Dong, Marie Loh und Adrian Mondry: The „Impact Factor“ Revisited (PDF jetzt online verfügbar). In: Biomedical Digital Libraries 2005, 2:7, published Dec, 5th. This narrative review explains how the impact factor is calculated, how bias is introduced into the calculation, which questions it can or cannot answer, and how different professional groups can benefit from the information that the impact factor provides.