(5)The determination of what constitutes a large position should be made by trading venues taking into account the size and composition of the market in question. For that purpose, trading venues should establish qualitative or quantitative criteria that are used to identify such large exposures and should have procedures in place to identify all positions held by any person which exceed such pre-determined accountability levels. Quantitative and qualitative criteria could be, amongst others, the size of the total open interest in the commodity derivative, the share of the position of the position holder, the volatility of the markets and the characteristics of the underlying commodity market. Where such levels are exceeded, the trading venue should seek to understand the rationale for the build-up of that large position. To that end, the trading venue should assess whether it needs to request additional information from the person holding that large position, considering in particular how frequently the positions held by that person exceed the accountability levels and the extent to which the accountability levels are exceeded. Such information could include, amongst other, positions in related products, the economic reason for the open position and the activity in a related underlying commodity market. Based on the information already available or gathered through the request for information, the trading venue should take appropriate actions where necessary.