Canada and BE have the most favourable eligibility rules for naturalisation (see box). Applicants do not meet the conditions if they have committed repeat or serious offences, or if they fail the language and citizenship tests. The tests are normally written and demand a simple knowledge of French or English, citizenship rights and responsibilities, history, politics, and geography. Applicants can prepare with a free government study guide. The circumstances of naturalised Canadians are taken into account before a decision is made to withdraw nationality. In case of a negative decision, avenues for appeal exist. Yet they have a slightly unfavourable security under the law, since they can lose their citizenship after any number of
years, even if they would be left stateless. However, migrants can hold dual nationality under policies that meet best practice (see box).