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"There is thus no ‘best procedure’ for external voting. Much will depend on the context, such as the infrastructure of those foreign countries where external voting is to be held. The decision on suitability will depend on the costs and practical aspects of the different procedures for external voting (...)."

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International IDEA: Voting From Abroad: The International IDEA Handbook, p. 69

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Voting From Abroad: The International IDEA Handbook

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Summaries

Residency requirements should not be excessive, or may be considered discriminatory.
Accommodation to vote should be made for voters with special needs, including eligible voters currently out of the country.
Methods to facilitate voting may include voting abroad.