7.30. Some compilers may use household surveys to collect specific information on outbound business travel. As indicated above, if such a survey is conducted as a telephone sample, compilers should be aware that frequent business travellers are difficult to reach, and they should therefore consider also using a specific sample of mobile phone numbers or developing a web-based survey. In general, when using a household survey, the compiler would focus on a specifically targeted set of the population, i.e., those travelling for business reasons, which may serve multiple needs, such as for national accounts, BOP or trade in services statistics. As it is a targeted survey, some specifically tailored questions could be included to help the compiler gather information that may be of interest for mode 4, in particular. Of course, as for other data collection described in this chapter, the level of detail one can expect from such a data source is relatively limited. However, by targeting some questions, it is possible to obtain more details on categories of specific interest to the compiling economy. Considering confidentiality issues and the sample size, mode 4 data could be presented in or aggregated to broad economic or geographical categories.
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