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2.52. There are a number of cases where statistical series, which purport to measure the same activity, are measured from different sources. One example relates to the travel debits item in the balance of payments. Indicator data to estimate travel expenditure abroad by Australian residents in current periods come from the International Travel Enterprises component of the Survey of International Trade in Services. This component collection approaches enterprises for payments made through them (prepayment through travel industry participants, Australian-issued travellers cheques and plastic cards, and cash). To provide benchmarks for this collection, the ABS periodically conducts a Survey of Returned Australian Travellers which approaches a sample of resident individuals returning to Australia (identified from passenger cards) for details of their expenditure abroad. Each of the two estimates of travel expenditure abroad can be expected to provide some insights into the accuracy of the other.