In order to avoid diverging interpretations and minimise the risk of ambiguity several questions have been reviewed, while various definitions of terms and references to the WTO Trade Facilitation Agreement articles were added as to provide explanatory support to the questions. The 2014 TFIs average for OECD countries is more or less the same whether calculated with the full sample of 33 countries or with the initial 25 countries only. Exceptions, such as in the case of documents, are described below.