Swedish law was significantly amended with effect from 1 July 2001 and from that date, dual citizenship is permitted without restriction.

A child aged 12 or more at the time of adoption may acquire Swedish citizenship by application.

[3] The duration of stay is calculated from the date on which a person submitted her or his application for a residence permit and were approved.

[5] Notification is a simpler method of acquiring Swedish citizenship (i.e. simplified naturalisation).

Adult citizens of other Nordic Council countries (Denmark, Norway, Iceland and Finland) are eligible for citizenship by notification, provided they have resided in Sweden for five years, without being sentenced to incarceration.

The changes to the law also mean that foreigners seeking naturalisation as a Swedish citizen do not need to renounce their former citizenship.

Swedish citizens who nonetheless hold Japanese citizenship must normally, under Japan's nationality law, notify Japan's Ministry of Justice, before turning 22, whether to keep their Swedish or Japanese citizenship.

The QNI considers, in addition, to travel freedom on internal factors such as peace & stability, economic strength, and human development as well.