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Visa

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Visa  (VISA)


Migration statistics1 are compiled to reveal the volume of migration (801-1), the direction of migratory movement (803-1), and the characteristics of migrants (801-1*). The accuracy with which each of these kinds of fact is ascertained depends upon the method of compilation, as most migration statistics consist of approximations and estimates rather than precise measurements. Direct measurement of migration2 requires a system of recording movements as they occur. In the case of overseas migration they may be based on passenger records3 or passenger lists3 of ships and aircraft. Counts of persons crossing a political frontier yield only very crude data unless special steps are taken to distinguish migrants from travellers4, who do not change their place of residence. The number of visas5 or entry permits5 granted and the number of residence permits6 or labour permits7 issued may also be used as an indication of the migration of foreign nationals. Changes of legal residence (310-6*) noted for voting purposes, transfers of school registration and similar figures may be used as an index of internal migration (802-5). Each of these sources may reflect a variety of movements other than those defined as migration or may fail to include movements which should be counted as migration.

  • 4. traveller n. — travel v. — travel n., the process of travelling,
  • 5. In certain countries residents who wish to travel abroad are required to obtain exit permits or exit visas, records of which may serve as a source of information on migratory movements.


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